Channel sensing procedures for communications at an integrated access and backhaul node

ABSTRACT

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for performing separate channel sensing procedures for transmissions via a mobile termination (MT) role and for transmissions via a distributed unit (DU) role of an integrated access and backhaul (IAB) node. In one aspect, the IAB node may obtain channel access for transmissions via the MT role by performing a first channel sensing procedure and may obtain channel access for transmissions via the DU role by performing a second channel sensing procedure. The IAB node may determine a first timing of a first sensing slot for performing the first channel sensing procedure and a second timing of a second sensing slot for performing the second channel sensing procedure in accordance with a capability of the IAB node and a transmission timing of the transmissions via the MT role and the DU role.

CROSS REFERENCE TO RELATED APPLICATIONS

The present Application for Patent claims the benefit of U.S.Provisional Patent Application No. 63/042,493 by LUO et al., entitled“CHANNEL SENSING PROCEDURES FOR COMMUNICATIONS AT AN INTEGRATED ACCESSAND BACKHAUL NODE,” filed Jun. 22, 2020, assigned to the assigneehereof, and expressly incorporated by reference herein.

TECHNICAL FIELD

The following relates generally to wireless communications and morespecifically to channel sensing procedures for communications at anintegrated access and backhaul (IAB) node.

DESCRIPTION OF THE RELATED TECHNOLOGY

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (for example, time, frequency, and power). Examples ofsuch multiple-access systems include fourth generation (4G) systems suchas Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform spread orthogonal frequency division multiplexing(DFT-S-OFDM). A wireless multiple-access communications system mayinclude one or more base stations or one or more network access nodes,each simultaneously supporting communication for multiple communicationdevices, which may be otherwise known as user equipment (UE).

SUMMARY

The systems, methods and devices of this disclosure each have severalinnovative aspects, no single one of which is solely responsible for thedesirable attributes disclosed herein.

One innovative aspect of the subject matter described in this disclosurecan be implemented in a method for wireless communications at a wirelessdevice apparatus. The method may include establishing a first wirelessrole and a second wireless role for the wireless device apparatus, wherethe first wireless role is associated with upstream communications, andthe second wireless role is associated with downstream communications,performing at least one of a first channel sensing procedure or a secondchannel sensing procedure at the wireless device apparatus, where thefirst channel sensing procedure is for the first wireless role and thesecond channel sensing procedure is for the second wireless role,initiating a channel occupancy time (COT) at the wireless deviceapparatus for the first wireless role in accordance with the firstchannel sensing procedure or for the second wireless role in accordancewith the second channel sensing procedure, or both, and transmittingduring the COT via at least one of the first wireless role or the secondwireless role.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a wireless device apparatus forwireless communications. The wireless device apparatus may include afirst interface, a second interface, and a processing system. Theprocessing system may be configured to establish a first wireless roleand a second wireless role for the wireless device apparatus, where thefirst wireless role is associated with upstream communications, and thesecond wireless role is associated with downstream communications. Theprocessing system may be configured to perform at least one of a firstchannel sensing procedure or a second channel sensing procedure at thewireless device apparatus, where the first channel sensing procedure isfor the first wireless role and the second channel sensing procedure isfor the second wireless role. The processing system may be configured toinitiate a COT at the wireless device apparatus for the first wirelessrole in accordance with the first channel sensing procedure or for thesecond wireless role in accordance with the second channel sensingprocedure, or both. The first interface may be configured to outputsignaling for transmission during the COT via at least one of the firstwireless role or the second wireless role.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in another wireless device apparatus forwireless communications. The wireless device apparatus may include aprocessor, memory coupled with the processor, and instructions stored inthe memory. The instructions may be executable by the processor to causethe apparatus to establish a first wireless role and a second wirelessrole for the wireless device apparatus, where the first wireless role isassociated with upstream communications, and the second wireless role isassociated with downstream communications, perform at least one of afirst channel sensing procedure or a second channel sensing procedure atthe wireless device apparatus, where the first channel sensing procedureis for the first wireless role and the second channel sensing procedureis for the second wireless role, initiate a COT at the wireless deviceapparatus for the first wireless role in accordance with the firstchannel sensing procedure or for the second wireless role in accordancewith the second channel sensing procedure, or both, and transmit duringthe COT via at least one of the first wireless role or the secondwireless role.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in another wireless device apparatus forwireless communications. The wireless device apparatus may include meansfor establishing a first wireless role and a second wireless role forthe wireless device apparatus, where the first wireless role isassociated with upstream communications, and the second wireless role isassociated with downstream communications, performing at least one of afirst channel sensing procedure or a second channel sensing procedure atthe wireless device apparatus, where the first channel sensing procedureis for the first wireless role and the second channel sensing procedureis for the second wireless role, initiating a COT at the wireless deviceapparatus for the first wireless role in accordance with the firstchannel sensing procedure or for the second wireless role in accordancewith the second channel sensing procedure, or both, and transmittingduring the COT via at least one of the first wireless role or the secondwireless role.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a non-transitory computer-readablemedium storing code for wireless communications at a wireless deviceapparatus. The code may include instructions executable by a processorto establish a first wireless role and a second wireless role for thewireless device apparatus, where the first wireless role is associatedwith upstream communications, and the second wireless role is associatedwith downstream communications, perform at least one of a first channelsensing procedure or a second channel sensing procedure at the wirelessdevice apparatus, where the first channel sensing procedure is for thefirst wireless role and the second channel sensing procedure is for thesecond wireless role, initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both, and transmit during the COT via atleast one of the first wireless role or the second wireless role.

One innovative aspect of the subject matter described in this disclosurecan be implemented in a method for wireless communications at a wirelessdevice apparatus. The method may include identifying a first value for afirst channel sensing procedure associated with a first wireless role ofthe wireless device apparatus and a second value for a second channelsensing procedure associated with a second wireless role of the wirelessdevice apparatus, determining whether at least one energy detection (ED)value associated with a channel satisfies at least one of the firstvalue or the second value, and determining whether to initiate a COT forat least one of the first wireless role or the second wireless role inaccordance with determining whether the at least one ED value associatedwith the channel satisfies at least one of the first value or the secondvalue.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a wireless device apparatus forwireless communications. The wireless device apparatus may include afirst interface, a second interface, and a processing system. Theprocessing system may be configured to identify a first value for afirst channel sensing procedure associated with a first wireless role ofthe wireless device apparatus and a second value for a second channelsensing procedure associated with a second wireless role of the wirelessdevice apparatus. The processing system may be configured to determinewhether at least one ED value associated with a channel satisfies atleast one of the first value or the second value. The processing systemmay be configured to determine whether to initiate a COT for at leastone of the first wireless role or the second wireless role in accordancewith determining whether the at least one ED value associated with thechannel satisfies at least one of the first value or the second value.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in another wireless device apparatus forwireless communications. The wireless device apparatus may include aprocessor, memory coupled with the processor, and instructions stored inthe memory. The instructions may be executable by the processor to causethe apparatus to identify a first value for a first channel sensingprocedure associated with a first wireless role of the wireless deviceapparatus and a second value for a second channel sensing procedureassociated with a second wireless role of the wireless device apparatus,determine whether at least one ED value associated with a channelsatisfies at least one of the first value or the second value, anddetermine whether to initiate a COT for at least one of the firstwireless role or the second wireless role in accordance with determiningwhether the at least one ED value associated with the channel satisfiesat least one of the first value or the second value.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in another wireless device apparatus forwireless communications. The wireless device apparatus may include meansfor identifying a first value for a first channel sensing procedureassociated with a first wireless role of the wireless device apparatusand a second value for a second channel sensing procedure associatedwith a second wireless role of the wireless device apparatus,determining whether at least one ED value associated with a channelsatisfies at least one of the first value or the second value, anddetermining whether to initiate a COT for at least one of the firstwireless role or the second wireless role in accordance with determiningwhether the at least one ED value associated with the channel satisfiesat least one of the first value or the second value.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a non-transitory computer-readablemedium storing code for wireless communications at a wireless deviceapparatus. The code may include instructions executable by a processorto identify a first value for a first channel sensing procedureassociated with a first wireless role of the wireless device apparatusand a second value for a second channel sensing procedure associatedwith a second wireless role of the wireless device apparatus, determinewhether at least one ED value associated with a channel satisfies atleast one of the first value or the second value, and determine whetherto initiate a COT for at least one of the first wireless role or thesecond wireless role in accordance with determining whether the at leastone ED value associated with the channel satisfies at least one of thefirst value or the second value.

Details of one or more implementations of the subject matter describedin this disclosure are set forth in the accompanying drawings and thedescription below. Other features, aspects, and advantages will becomeapparent from the description, the drawings and the claims. Note thatthe relative dimensions of the following figures may not be drawn toscale.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example wireless communications system thatsupports channel sensing procedures for communications at an integratedaccess and backhaul (IAB) node.

FIGS. 2 and 3 illustrate example IAB networks that support channelsensing procedures for communications at an IAB node.

FIG. 4 illustrates example channel sensing configurations that supportchannel sensing procedures for communications at an IAB node.

FIGS. 5A and 5B illustrate example communications timelines that supportchannel sensing procedures for communications at an IAB node.

FIG. 6 illustrates an example alignment procedure that supports channelsensing procedures for communications at an IAB node.

FIGS. 7 and 8 illustrate example process flows that support channelsensing procedures for communications at an IAB node.

FIG. 9 shows a block diagram of an example device that supports channelsensing procedures for communications at an IAB node.

FIGS. 10-18 show flowcharts illustrating methods that support channelsensing procedures for communications at an IAB node.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

The following description is directed to certain implementations for thepurposes of describing the innovative aspects of this disclosure.However, a person having ordinary skill in the art will readilyrecognize that the teachings herein can be applied in a multitude ofdifferent ways. The described implementations may be implemented in anydevice, system or network that is capable of transmitting and receivingradio frequency (RF) signals according to any of the IEEE 16.11standards, or any of the IEEE 802.11 standards, the Bluetooth® standard,code division multiple access (CDMA), frequency division multiple access(FDMA), time division multiple access (TDMA), Global System for Mobilecommunications (GSM), GSM/General Packet Radio Service (GPRS), EnhancedData GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA),Wideband-CDMA (W-CDMA), Evolution Data Optimized (EV-DO), 1×EV-DO, EV-DORev A, EV-DO Rev B, High Speed Packet Access (HSPA), High Speed DownlinkPacket Access (HSDPA), High Speed Uplink Packet Access (HSUPA), EvolvedHigh Speed Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, orother known signals that are used to communicate within a wireless,cellular or internet of things (IOT) network, such as a system utilizing3G, 4G or 5G, or further implementations thereof, technology.

In some wireless communications systems, an integrated access andbackhaul (IAB) node may communicate with one or more upstream devices,such as with a parent IAB node or an IAB donor node, via a backhaul linkand may communicate with one or more downstream devices, such as a childIAB node or a user equipment (UE), via an access link or a backhaullink. The IAB node may communicate with the upstream devices using amobile termination (MT) role or functionality of the IAB node and maycommunicate with the downstream devices using a distributed unit (DU)role or functionality of the IAB node. In some examples, the IAB nodemay communicate over a shared spectrum, such as a shared channel, andmay perform a channel sensing procedure to determine whether the channelis available for transmissions from the IAB node. For example, the IABnode may identify one or more transmissions from the IAB node (via theMT role or the DU role, or both) and may perform the channel sensingprocedure prior to transmitting the transmissions to avoid transmittingat the same time as another, potentially interfering device.

In some implementations, the IAB node may perform separate channelsensing procedures for the transmissions from the IAB node in accordancewith the wireless role that the IAB node may use to transmit thetransmissions. For example, the IAB node may perform a first channelsensing procedure to obtain channel access for transmissions that arescheduled via the MT role of the IAB node and may perform a secondchannel sensing procedure to obtain channel access for transmissionsthat are scheduled via the DU role of the IAB node. The IAB node mayselect, configure, or otherwise determine a first timing of a firstsensing slot for performing the first channel sensing procedure and asecond timing of a second sensing slot for performing the second channelsensing procedure in accordance with one or more capabilities of the IABnode and a timing of the transmissions. For example, the IAB node mayselect, configure, or otherwise determine whether the first sensing slotor the second sensing slot may overlap in time with another transmissionfrom the IAB node in accordance with a sensing capability of the IABnode or may select, configure, or otherwise determine which transmissionthe first sensing slot or the second sensing slot, or both, may alignwith (in time). The IAB node may perform the first channel sensingprocedure during the first sensing slot by measuring an energy of theshared channel and comparing the measured energy to a first energydetection (ED) threshold associated with the first channel sensingprocedure. Similarly, the IAB node may perform the second channelsensing procedure during the second sensing slot by measuring an energyof the shared channel and comparing the measured energy to a second EDthreshold associated with the second channel sensing procedure. The IABnode may initiate a channel occupancy time (COT) for the transmissionsvia the MT role or the DU role, or both, in accordance with whether themeasured energy satisfies (is less than or equal to) the first EDthreshold or the second ED threshold, or both.

Particular implementations of the subject matter described in thisdisclosure can be implemented to realize one or more of the followingpotential advantages. For example, by supporting separate channelsensing procedures to initiate a COT for transmissions via differentwireless roles of an IAB node, the IAB node may more reliably or maymore accurately obtain channel access. For example, in examples in whichthe MT role and the DU role of the IAB node use different antenna panelsof the IAB node or otherwise have different radio frequency footprints,the IAB node may more optimally align the radio frequency footprint of achannel sensing procedure to the different radio frequency footprints ofthe MT role and the DU role if the IAB node uses a different channelsensing procedure for each of the MT role and the DU role. As a resultof performing more reliable or more accurate channel sensing, thetransmissions from the IAB node may be less likely to be adverselyinfluenced by interference from another transmitting device, which mayincrease the likelihood that a receiving device is able to successfullyreceive the transmission from the IAB node. As such, the IAB node mayachieve higher data rates and greater spectral efficiency because theIAB node may potentially perform fewer retransmissions (due to thehigher likelihood for successful communication).

The described techniques also can be implemented to provide forconfiguring the separate channel sensing procedures in accordance withone or more conditions at the IAB node. For example, the first EDthreshold of the first channel sensing procedure and the second EDthreshold of the second channel sensing procedure may be configured forthe MT role and the DU role, respectively, and in accordance with thesensing beams associated with the MT role and the DU role, respectively,the class of the MT role and the class of the DU role, respectively, orwhether the IAB node is transmitting during the first sensing slot orthe second sensing slot, respectively. As such, a parent IAB node or anIAB donor node (a central unit (CU) of an IAB donor node) may havegreater flexibility if configuring the IAB node to perform the separatechannel sensing procedures. Further, the separate channel sensingprocedures may be more reliable or more accurate if the IAB node uses EDthresholds that are configured or otherwise determined in accordancewith the conditions at the IAB node.

FIG. 1 illustrates an example wireless communications system 100 thatsupports channel sensing procedures for communications at an IAB node.The wireless communications system 100 may include one or more basestations 105, one or more UEs 115, and a core network 130. In someexamples, the wireless communications system 100 may be a Long TermEvolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pronetwork, or a New Radio (NR) network. In some examples, the wirelesscommunications system 100 may support enhanced broadband communications,ultra-reliable (for example, mission critical) communications, lowlatency communications, communications with low-cost and low-complexitydevices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area toform the wireless communications system 100 and may be devices indifferent forms or having different capabilities. The base stations 105and the UEs 115 may wirelessly communicate via one or more communicationlinks 125. Each base station 105 may provide a geographic coverage area110 over which the UEs 115 and the base station 105 may establish one ormore communication links 125. The geographic coverage area 110 may be anexample of a geographic area over which a base station 105 and a UE 115may support the communication of signals according to one or more radioaccess technologies.

The UEs 115 may be dispersed throughout a geographic coverage area 110of the wireless communications system 100, and each UE 115 may bestationary, or mobile, or both at different times. The UEs 115 may bedevices in different forms or having different capabilities. Someexample UEs 115 are illustrated in FIG. 1 . The UEs 115 described hereinmay be able to communicate with various types of devices, such as otherUEs 115, the base stations 105, or network equipment (for example, corenetwork nodes, relay devices, IAB nodes, or other network equipment), asshown in FIG. 1 .

The base stations 105 may communicate with the core network 130, or withone another, or both. For example, the base stations 105 may interfacewith the core network 130 through one or more backhaul links 120 (forexample, via an S1, N2, N3, or another interface). The base stations 105may communicate with one another over the backhaul links 120 (forexample, via an X2, Xn, or another interface) either directly (forexample, directly between base stations 105), or indirectly (forexample, via core network 130), or both. In some examples, the backhaullinks 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or maybe referred to by a person having ordinary skill in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or agiga-NodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, awireless device, a remote device, a handheld device, or a subscriberdevice, or some other suitable terminology, where the “device” also maybe referred to as a unit, a station, a terminal, or a client, amongother examples. A UE 115 also may include or may be referred to as apersonal electronic device such as a cellular phone, a personal digitalassistant (PDA), a tablet computer, a laptop computer, or a personalcomputer. In some examples, a UE 115 may include or be referred to as awireless local loop (WLL) station, an Internet of Things (IoT) device,an Internet of Everything (IoE) device, or a machine type communications(MTC) device, among other examples, which may be implemented in variousobjects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with varioustypes of devices, such as other UEs 115 that may sometimes act as relaysas well as the base stations 105 and the network equipment includingmacro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations,among other examples, as shown in FIG. 1 .

The UEs 115 and the base stations 105 may wirelessly communicate withone another via one or more communication links 125 over one or morecarriers. The term “carrier” may refer to a set of radio frequencyspectrum resources having a defined physical layer structure forsupporting the communication links 125. For example, a carrier used fora communication link 125 may include a portion of a radio frequencyspectrum band (for example, a bandwidth part (BWP)) that is operatedaccording to one or more physical layer channels for a given radioaccess technology (for example, LTE, LTE-A, LTE-A Pro, NR). Eachphysical layer channel may carry acquisition signaling (for example,synchronization signals, system information), control signaling thatcoordinates operation for the carrier, user data, or other signaling.The wireless communications system 100 may support communication with aUE 115 using carrier aggregation or multi-carrier operation. A UE 115may be configured with multiple downlink component carriers and one ormore uplink component carriers according to a carrier aggregationconfiguration. Carrier aggregation may be used with both frequencydivision duplexing (FDD) and time division duplexing (TDD) componentcarriers.

In some examples (for example, in a carrier aggregation configuration),a carrier also may have acquisition signaling or control signaling thatcoordinates operations for other carriers. A carrier may be associatedwith a frequency channel (for example, an evolved universal mobiletelecommunication system terrestrial radio access (E-UTRA) absoluteradio frequency channel number (EARFCN)) and may be positioned accordingto a channel raster for discovery by the UEs 115. A carrier may beoperated in a standalone mode where initial acquisition and connectionmay be conducted by the UEs 115 via the carrier, or the carrier may beoperated in a non-standalone mode where a connection is anchored using adifferent carrier (for example, of the same or a different radio accesstechnology).

The communication links 125 shown in the wireless communications system100 may include uplink transmissions from a UE 115 to a base station105, or downlink transmissions from a base station 105 to a UE 115.Carriers may carry downlink or uplink communications (for example, in anFDD mode) or may be configured to carry downlink and uplinkcommunications (for example, in a TDD mode).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of determined bandwidths for carriers of a particular radioaccess technology (for example, 1.4, 3, 5, 10, 15, 20, 40, or 80megahertz (MHz)). Devices of the wireless communications system 100 (forexample, the base stations 105, the UEs 115, or both) may have hardwareconfigurations that support communications over a particular carrierbandwidth or may be configurable to support communications over one of aset of carrier bandwidths. In some examples, the wireless communicationssystem 100 may include base stations 105 or UEs 115 that supportsimultaneous communications via carriers associated with multiplecarrier bandwidths. In some examples, each served UE 115 may beconfigured for operating over portions (for example, a sub-band, a BWP)or all of a carrier bandwidth.

Signal waveforms transmitted over a carrier may be made up of multiplesubcarriers (for example, using multi-carrier modulation (MCM)techniques such as orthogonal frequency division multiplexing (OFDM) ordiscrete Fourier transform spread OFDM (DFT-S-OFDM)). In a systememploying MCM techniques, a resource element may include one symbolperiod (for example, a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (for example, the order of the modulationscheme, the coding rate of the modulation scheme, or both). Thus, themore resource elements that a UE 115 receives and the higher the orderof the modulation scheme, the higher the data rate may be for the UE115. A wireless communications resource may refer to a combination of aradio frequency spectrum resource, a time resource, and a spatialresource (for example, spatial layers or beams), and the use of multiplespatial layers may further increase the data rate or data integrity forcommunications with a UE 115.

One or more numerologies for a carrier may be supported, where anumerology may include a subcarrier spacing (Δf) and a cyclic prefix. Acarrier may be divided into one or more BWPs having the same ordifferent numerologies. In some examples, a UE 115 may be configuredwith multiple BWPs. In some examples, a single BWP for a carrier may beactive at a given time and communications for the UE 115 may berestricted to one or more active BWPs.

The time intervals for the base stations 105 or the UEs 115 may beexpressed in multiples of a basic time unit which may, for example,refer to a sampling period of T_(s)=1/(Δf_(max)·N_(f)) seconds, whereΔf_(max) may represent the maximum supported subcarrier spacing, andN_(f) may represent the maximum supported discrete Fourier transform(DFT) size. Time intervals of a communications resource may be organizedaccording to radio frames each having a specified duration (for example,10 milliseconds (ms)). Each radio frame may be identified by a systemframe number (SFN) (for example, ranging from 0 to 1023).

Each frame may include multiple consecutively numbered subframes orslots, and each subframe or slot may have the same duration. In someexamples, a frame may be divided (for example, in the time domain) intosubframes, and each subframe may be further divided into a number ofslots. Alternatively, each frame may include a variable number of slots,and the number of slots may depend on subcarrier spacing. Each slot mayinclude a number of symbol periods (for example, depending on the lengthof the cyclic prefix prepended to each symbol period). In some wirelesscommunications systems 100, a slot may further be divided into multiplemini-slots containing one or more symbols. Excluding the cyclic prefix,each symbol period may contain one or more (for example, N_(f)) samplingperiods. The duration of a symbol period may depend on the subcarrierspacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallestscheduling unit (for example, in the time domain) of the wirelesscommunications system 100 and may be referred to as a transmission timeinterval (TTI). In some examples, the TTI duration (for example, thenumber of symbol periods in a TTI) may be variable. Additionally, oralternatively, the smallest scheduling unit of the wirelesscommunications system 100 may be dynamically selected (for example, inbursts of shortened TTIs (sTTIs)).

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using one or more oftime division multiplexing (TDM) techniques, frequency divisionmultiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A controlregion (for example, a control resource set (CORESET)) for a physicalcontrol channel may be defined by a number of symbol periods and mayextend across the system bandwidth or a subset of the system bandwidthof the carrier. One or more control regions (for example, CORESETs) maybe configured for a set of the UEs 115. For example, one or more of theUEs 115 may monitor or search control regions for control informationaccording to one or more search space sets, and each search space setmay include one or multiple control channel candidates in one or moreaggregation levels arranged in a cascaded manner. An aggregation levelfor a control channel candidate may refer to a number of control channelresources (for example, control channel elements (CCEs)) associated withencoded information for a control information format having a givenpayload size. Search space sets may include common search space setsconfigured for sending control information to multiple UEs 115 andUE-specific search space sets for sending control information to aspecific UE 115.

Each base station 105 may provide communication coverage via one or morecells, for example a macro cell, a small cell, a hot spot, or othertypes of cells, or any combination thereof. The term “cell” may refer toa logical communication entity used for communication with a basestation 105 (for example, over a carrier) and may be associated with anidentifier for distinguishing neighboring cells (for example, a physicalcell identifier (PCID), a virtual cell identifier (VCID), or others). Insome examples, a cell also may refer to a geographic coverage area 110or a portion of a geographic coverage area 110 (for example, a sector)over which the logical communication entity operates. Such cells mayrange from smaller areas (for example, a structure, a subset ofstructure) to larger areas depending on various factors such as thecapabilities of the base station 105. For example, a cell may be orinclude a building, a subset of a building, or exterior spaces betweenor overlapping with geographic coverage areas 110, among other examples.

A macro cell generally covers a relatively large geographic area (forexample, several kilometers in radius) and may allow unrestricted accessby the UEs 115 with service subscriptions with the network providersupporting the macro cell. A small cell may be associated with alower-powered base station 105, as compared with a macro cell, and asmall cell may operate in the same or different (for example, licensed,unlicensed) frequency bands as macro cells. Small cells may provideunrestricted access to the UEs 115 with service subscriptions with thenetwork provider or may provide restricted access to the UEs 115 havingan association with the small cell (for example, the UEs 115 in a closedsubscriber group (CSG), the UEs 115 associated with users in a home oroffice). A base station 105 may support one or multiple cells and alsomay support communications over the one or more cells using one ormultiple component carriers.

In some examples, a carrier may support multiple cells, and differentcells may be configured according to different protocol types (forexample, MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB))that may provide access for different types of devices.

In some examples, a base station 105 may be movable and thereforeprovide communication coverage for a moving geographic coverage area110. In some examples, different geographic coverage areas 110associated with different technologies may overlap, but the differentgeographic coverage areas 110 may be supported by the same base station105. In other examples, the overlapping geographic coverage areas 110associated with different technologies may be supported by differentbase stations 105. The wireless communications system 100 may include,for example, a heterogeneous network in which different types of thebase stations 105 provide coverage for various geographic coverage areas110 using the same or different radio access technologies.

The wireless communications system 100 may support synchronous orasynchronous operation. For synchronous operation, the base stations 105may have similar frame timings, and transmissions from different basestations 105 may be approximately aligned in time. For asynchronousoperation, the base stations 105 may have different frame timings, andtransmissions from different base stations 105 may, in some examples,not be aligned in time. The techniques described herein may be used foreither synchronous or asynchronous operations.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices and may provide for automated communication betweenmachines (for example, via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay such information to acentral server or application program that makes use of the informationor presents the information to humans interacting with the applicationprogram. Some UEs 115 may be designed to collect information or enableautomated behavior of machines or other devices. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (for example, amode that supports one-way communication via transmission or reception,but not transmission and reception simultaneously). In some examples,half-duplex communications may be performed at a reduced peak rate.Other power conservation techniques for the UEs 115 include entering apower saving deep sleep mode when not engaging in active communications,operating over a limited bandwidth (for example, according to narrowbandcommunications), or a combination of these techniques. For example, someUEs 115 may be configured for operation using a narrowband protocol typethat is associated with a defined portion or range (for example, set ofsubcarriers or resource blocks (RBs)) within a carrier, within aguard-band of a carrier, or outside of a carrier.

The wireless communications system 100 may be configured to supportultra-reliable communications or low-latency communications, or variouscombinations thereof. For example, the wireless communications system100 may be configured to support ultra-reliable low-latencycommunications (URLLC) or mission critical communications. The UEs 115may be designed to support ultra-reliable, low-latency, or criticalfunctions (for example, mission critical functions). Ultra-reliablecommunications may include private communication or group communicationand may be supported by one or more mission critical services such asmission critical push-to-talk (MCPTT), mission critical video (MCVideo),or mission critical data (MCData). Support for mission criticalfunctions may include prioritization of services, and mission criticalservices may be used for public safety or general commercialapplications. The terms ultra-reliable, low-latency, mission critical,and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 also may be able to communicate directly withother UEs 115 over a device-to-device (D2D) communication link 135 (forexample, using a peer-to-peer (P2P) or D2D protocol). One or more UEs115 utilizing D2D communications may be within the geographic coveragearea 110 of a base station 105. Other UEs 115 in such a group may beoutside the geographic coverage area 110 of a base station 105 or beotherwise unable to receive transmissions from a base station 105. Insome examples, groups of the UEs 115 communicating via D2Dcommunications may utilize a one-to-many (1:M) system in which each UE115 transmits to every other UE 115 in the group. In some examples, abase station 105 facilitates the scheduling of resources for D2Dcommunications. In some other examples, D2D communications are carriedout between the UEs 115 without the involvement of a base station 105.

In some systems, the D2D communication link 135 may be an example of acommunication channel, such as a sidelink communication channel, betweenvehicles (for example, UEs 115). In some examples, vehicles maycommunicate using vehicle-to-everything (V2X) communications,vehicle-to-vehicle (V2V) communications, or some combination of these. Avehicle may signal information related to traffic conditions, signalscheduling, weather, safety, emergencies, or any other informationrelevant to a V2X system. In some examples, vehicles in a V2X system maycommunicate with roadside infrastructure, such as roadside units, orwith the network via one or more network nodes (for example, basestations 105) using vehicle-to-network (V2N) communications, or withboth.

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC) or 5G core (5GC), which may include at leastone control plane entity that manages access and mobility (for example,a mobility management entity (MME), an access and mobility managementfunction (AMF)) and at least one user plane entity that routes packetsor interconnects to external networks (for example, a serving gateway(S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user planefunction (UPF)). The control plane entity may manage non-access stratum(NAS) functions such as mobility, authentication, and bearer managementfor the UEs 115 served by the base stations 105 associated with the corenetwork 130. User IP packets may be transferred through the user planeentity, which may provide IP address allocation as well as otherfunctions. The user plane entity may be connected to the networkoperators IP services 150. The operators IP services 150 may includeaccess to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS),or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may includesubcomponents such as an access network entity 140, which may be anexample of an access node controller (ANC). Each access network entity140 may communicate with the UEs 115 through one or more other accessnetwork transmission entities 145, which may be referred to as radioheads, smart radio heads, or transmission/reception points (TRPs). Eachaccess network transmission entity 145 may include one or more antennapanels. In some configurations, various functions of each access networkentity 140 or base station 105 may be distributed across various networkdevices (for example, radio heads and ANCs) or consolidated into asingle network device (for example, a base station 105).

The wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 megahertz (MHz) to 300gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known asthe ultra-high frequency (UHF) region or decimeter band because thewavelengths range from approximately one decimeter to one meter inlength. The UHF waves may be blocked or redirected by buildings andenvironmental features, but the waves may penetrate structuressufficiently for a macro cell to provide service to the UEs 115 locatedindoors. The transmission of UHF waves may be associated with smallerantennas and shorter ranges (for example, less than 100 kilometers)compared to transmission using the smaller frequencies and longer wavesof the high frequency (HF) or very high frequency (VHF) portion of thespectrum below 300 MHz.

The wireless communications system 100 also may operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band, or in an extremely high frequency (EHF)region of the spectrum (for example, from 30 GHz to 300 GHz), also knownas the millimeter band. In some examples, the wireless communicationssystem 100 may support millimeter wave (mmW) communications between theUEs 115 and the base stations 105, and EHF antennas of the respectivedevices may be smaller and more closely spaced than UHF antennas. Insome examples, this may facilitate use of antenna arrays within adevice. The propagation of EHF transmissions, however, may be subject toeven greater atmospheric attenuation and shorter range than SHF or UHFtransmissions. The techniques disclosed herein may be employed acrosstransmissions that use one or more different frequency regions, anddesignated use of bands across these frequency regions may differ bycountry or regulating body.

The wireless communications system 100 may utilize both licensed andunlicensed radio frequency spectrum bands. For example, the wirelesscommunications system 100 may employ License Assisted Access (LAA),LTE-Unlicensed (LTE-U) radio access technology, or NR technology in anunlicensed band such as the 5 GHz industrial, scientific, and medical(ISM) band. When operating in unlicensed radio frequency spectrum bands,devices such as the base stations 105 and the UEs 115 may employ carriersensing for collision detection and avoidance. In some examples,operations in unlicensed bands may be in accordance with a carrieraggregation configuration in conjunction with component carriersoperating in a licensed band (for example, LAA). Operations inunlicensed spectrum may include downlink transmissions, uplinktransmissions, P2P transmissions, or D2D transmissions, among otherexamples.

A base station 105 or a UE 115 may be equipped with multiple antennas,which may be used to employ techniques such as transmit diversity,receive diversity, multiple-input multiple-output (MIMO) communications,or beamforming. The antennas of a base station 105 or a UE 115 may belocated within one or more antenna arrays or antenna panels, which maysupport MIMO operations or transmit or receive beamforming. For example,one or more base station antennas or antenna arrays may be co-located atan antenna assembly, such as an antenna tower. In some examples,antennas or antenna arrays associated with a base station 105 may belocated in diverse geographic locations. A base station 105 may have anantenna array with a number of rows and columns of antenna ports thatthe base station 105 may use to support beamforming of communicationswith a UE 115. Likewise, a UE 115 may have one or more antenna arraysthat may support various MIMO or beamforming operations. Additionally,or alternatively, an antenna panel may support radio frequencybeamforming for a signal transmitted via an antenna port.

The base stations 105 or the UEs 115 may use MIMO communications toexploit multipath signal propagation and increase the spectralefficiency by transmitting or receiving multiple signals via differentspatial layers. Such techniques may be referred to as spatialmultiplexing. The multiple signals may, for example, be transmitted bythe transmitting device via different antennas or different combinationsof antennas. Likewise, the multiple signals may be received by thereceiving device via different antennas or different combinations ofantennas. Each of the multiple signals may be referred to as a separatespatial stream and may carry bits associated with the same data stream(for example, the same codeword) or different data streams (for example,different codewords). Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO), where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO), where multiple spatial layers are transmitted tomultiple devices.

Beamforming, which also may be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (for example, a base station 105, a UE 115) to shape orsteer an antenna beam (for example, a transmit beam, a receive beam)along a spatial path between the transmitting device and the receivingdevice. Beamforming may be achieved by combining the signalscommunicated via antenna elements of an antenna array such that somesignals propagating at particular orientations with respect to anantenna array experience constructive interference while othersexperience destructive interference. The adjustment of signalscommunicated via the antenna elements may include a transmitting deviceor a receiving device applying amplitude offsets, phase offsets, or bothto signals carried via the antenna elements associated with the device.The adjustments associated with each of the antenna elements may bedefined by a beamforming weight set associated with a particularorientation (for example, with respect to the antenna array of thetransmitting device or receiving device, or with respect to some otherorientation).

A base station 105 or a UE 115 may use beam sweeping techniques as partof beam forming operations. For example, a base station 105 may usemultiple antennas or antenna arrays (for example, antenna panels) toconduct beamforming operations for directional communications with a UE115. Some signals (for example, synchronization signals, referencesignals, beam selection signals, or other control signals) may betransmitted by a base station 105 multiple times in differentdirections. For example, the base station 105 may transmit a signalaccording to different beamforming weight sets associated with differentdirections of transmission. Transmissions in different beam directionsmay be used to identify (for example, by a transmitting device, such asa base station 105, or by a receiving device, such as a UE 115) a beamdirection for later transmission or reception by the base station 105.

Some signals, such as data signals associated with a particularreceiving device, may be transmitted by a base station 105 in a singlebeam direction (for example, a direction associated with the receivingdevice, such as a UE 115). In some examples, the beam directionassociated with transmissions along a single beam direction may bedetermined in accordance with a signal that was transmitted in one ormore beam directions. For example, a UE 115 may receive one or more ofthe signals transmitted by the base station 105 in different directionsand may report to the base station 105 an indication of the signal thatthe UE 115 received with a highest signal quality or an otherwiseacceptable signal quality.

In some examples, transmissions by a device (for example, by a basestation 105 or a UE 115) may be performed using multiple beamdirections, and the device may use a combination of digital precoding orradio frequency beamforming to generate a combined beam for transmission(for example, from a base station 105 to a UE 115). The UE 115 mayreport feedback that indicates precoding weights for one or more beamdirections, and the feedback may correspond to a configured number ofbeams across a system bandwidth or one or more sub-bands. The basestation 105 may transmit a reference signal (for example, acell-specific reference signal (CRS), a channel state informationreference signal (CSI-RS)), which may be precoded or unprecoded. The UE115 may provide feedback for beam selection, which may be a precodingmatrix indicator (PMI) or codebook-based feedback (for example, amulti-panel type codebook, a linear combination type codebook, a portselection type codebook). Although these techniques are described withreference to signals transmitted in one or more directions by a basestation 105, a UE 115 may employ similar techniques for transmittingsignals multiple times in different directions (for example, foridentifying a beam direction for subsequent transmission or reception bythe UE 115) or for transmitting a signal in a single direction (forexample, for transmitting data to a receiving device).

A receiving device (for example, a UE 115) may try multiple receiveconfigurations (for example, directional listening) when receivingvarious signals from the base station 105, such as synchronizationsignals, reference signals, beam selection signals, or other controlsignals. For example, a receiving device may try multiple receivedirections by receiving via different antenna subarrays, by processingreceived signals according to different antenna subarrays, by receivingaccording to different receive beamforming weight sets (for example,different directional listening weight sets) applied to signals receivedat multiple antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at multiple antenna elements of an antennaarray, any of which may be referred to as “listening” according todifferent receive configurations or receive directions. In someexamples, a receiving device may use a single receive configuration toreceive along a single beam direction (for example, when receiving adata signal). The single receive configuration may be aligned in a beamdirection determined as a result of listening according to differentreceive configuration directions (for example, a beam directiondetermined to have a highest signal strength, highest signal-to-noiseratio (SNR), or otherwise acceptable signal quality as a result oflistening according to multiple beam directions).

The wireless communications system 100 may be a packet-based networkthat operates according to a layered protocol stack. In the user plane,communications at the bearer or Packet Data Convergence Protocol (PDCP)layer may be IP-based. A Radio Link Control (RLC) layer may performpacket segmentation and reassembly to communicate over logical channels.A Medium Access Control (MAC) layer may perform priority handling andmultiplexing of logical channels into transport channels. The MAC layeralso may use error detection techniques, error correction techniques, orboth to support retransmissions at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or a corenetwork 130 supporting radio bearers for user plane data. At thephysical layer, transport channels may be mapped to physical channels.

The UEs 115 and the base stations 105 may support retransmissions ofdata to increase the likelihood that data is received successfully.Hybrid automatic repeat request (HARQ) feedback is one technique forincreasing the likelihood that data is received correctly over acommunication link 125. HARQ may include a combination of errordetection (for example, using a cyclic redundancy check (CRC)), forwarderror correction (FEC), and retransmission (for example, automaticrepeat request (ARQ)). HARQ may improve throughput at the MAC layer inpoor radio conditions (for example, low signal-to-noise conditions). Insome examples, a device may support same-slot HARQ feedback, where thedevice may provide HARQ feedback in a specific slot for data received ina previous symbol in the slot. In some other examples, the device mayprovide HARQ feedback in a subsequent slot, or according to some othertime interval.

The wireless communications system 100 may be an NR system that mayutilize any combination of licensed, shared, and unlicensed spectrumbands, among others. In some examples, the NR unlicensed (NR-U) orshared spectrum may increase spectrum utilization and spectralefficiency as a result of the sharing of resources between deviceswithin the wireless communications system 100. To transmit over a sharedspectrum, a device may perform a channel sensing procedure to determinewhether a channel (such as a shared spectrum channel) is currently beingused by another, potentially interfering device.

In some implementations, the wireless communications system 100 maysupport separate channel sensing procedures at an IAB node with multiplewireless roles. For example, the IAB node may establish an MT role orfunctionality for upstream communications (for example, forcommunications over a wireless backhaul link 120) and a DU role orfunctionality for downstream communications (for example, forcommunications over a wireless access link, such as a communicationslink 125, or over a wireless backhaul link 120) and may perform a firstchannel sensing procedure to obtain channel access for transmissions viathe MT role and a second channel sensing procedure to obtain channelaccess for transmissions via the DU role. The IAB node may select,configure, or otherwise determine a timing of a first sensing slot forperforming the first channel sensing procedure or a timing of a secondsensing slot for performing the second channel sensing procedure inaccordance with a transmission timing of the transmissions via the MTrole or in accordance with a transmission timing of the transmissionsvia the DU role, or both.

The IAB node may perform the first channel sensing procedure bymeasuring an energy of a channel (a shared channel) during the firstsensing slot and comparing the measured energy, which may be referred toherein as an ED value, to a first ED threshold of the first channelsensing procedure. The IAB node may initiate a COT (or select,configure, or determine whether to initiate a COT) for the transmissionsvia the MT role in accordance with whether the measured energy satisfies(is less than or equal to) the first ED threshold, a timing of thetransmissions via the MT role and a timing of the transmissions via theDU role, a duplexing capability of the IAB node, or any combinationthereof. Similarly, the IAB node may perform the second channel sensingprocedure by measuring an energy of a channel (which may be the samechannel sensed by the first channel sensing procedure or a differentchannel) during the second sensing slot and comparing the measuredenergy to a second ED threshold of the second channel sensing procedure.The IAB node may initiate a COT (or select, configure, or determinewhether to initiate a COT) for the transmissions via the DU role inaccordance with whether the measured energy satisfies (is less than orequal to) the second ED threshold, a timing of the transmissions via theMT role and a timing of the transmissions via the DU role, a duplexingcapability of the IAB node, or any combination thereof.

FIG. 2 illustrates an example IAB network 200 that supports channelsensing procedures for communications at an IAB node. In some examples,the IAB network 200 may implement aspects of the wireless communicationssystem 100. The IAB network 200 may be a 5G NR system, such as an mmWsystem, and may supplement wireline backhaul connections (such as awireline backhaul link 220) by sharing infrastructure and spectralresources for network access among devices that support wirelessbackhaul capabilities, providing an IAB network architecture.

For example, the IAB network 200 illustrates an IAB network architectureincluding a core network 205, an IAB donor node 210, a number of IABnodes 215 (which may be examples of IAB relay nodes), and a number ofUEs 115. The IAB network 200 may support an overlay of access networksand backhaul networks between access nodes to enable communicationsbetween a UE 115 and the core network 205 via one or more wireless orwireline links. Such access networks may include communications betweenan access node, such as the IAB donor node 210 or an IAB node 215, and aUE 115 and such backhaul networks may include communications betweendifferent access nodes. In some examples, communications towards a UE115 may be referred to as downstream communications and communicationstowards the core network 205 may be referred to as upstreamcommunications.

The IAB network 200 may include one or more IAB donor nodes 210 that mayfunction as an interface between a wireline network and a wirelessnetwork. For example, the IAB donor node 210 may include at least onewireline backhaul link 220 over which the IAB donor node 210 maycommunicate with the core network 205 and one or more wireless links,such as wireless backhaul links 225 or access links 235, over which theIAB donor node 210 may communicate with UEs 115 or IAB nodes 215 (forexample, child nodes). In some aspects, the IAB donor node 210 may bereferred to as an anchor node as a result of the wireline backhaul link220 between the IAB donor node 210 and the core network 205. The IABdonor node 210 may be split into or otherwise function in two wirelessroles or as two entities. For example, the IAB donor node 210 may besplit into or otherwise function in a CU role and a DU role, where theDU associated with the IAB donor node 210 may be at least partiallycontrolled by the associated CU of the IAB donor node 210. In someaspects, the CU role and the DU role of the IAB donor node 210 may bedifferent entities. In some other aspects, the CU role and the DU roleof the IAB donor node 210 may be included within the same entity, butmay functionally operate as two different entities (for example, the IABdonor node 210 may use different software if communicating via the CUrole than if communicating via the DU role).

The CU of the IAB donor node 210 may support layer 3 (L3) functionalityand signaling, such as RRC or PDCP layer functions, and, in someexamples, the IAB donor node 210 may control the IAB network throughconfiguration signaling via the CU role. The DU of the IAB donor node210 may hold lower layer operations, such as layer 1 (L1) or layer 2(L2) functionality and signaling. For example, the DU of the IAB donornode 210 may hold RLC, MAC, or physical layer functions. In someexamples, the IAB donor node 210, via the DU role, may control both theaccess links 235 and the wireless backhaul links 225 within an IABnetwork coverage area and may provide control information and schedulinginformation for descendent (for example, child) IAB nodes 215 or UEs115, or both. For example, the IAB donor node 210, via the DU role, maysupport an RLC channel connection with a UE 115 (via an access link 235)or with an IAB node 215 (via a wireless backhaul link 225).

The IAB nodes 215 also may be split into or otherwise function in twowireless roles or as two entities. For example, an IAB node 215 may besplit into or otherwise function in a mobile termination (MT) role and aDU role, where the MT role of the IAB node 215 may be at least partiallycontrolled or scheduled by parent nodes, such as a parent IAB node 215or the IAB donor node 210. In some aspects, the MT role and the DU roleof the IAB node 215 may be different entities. In some other aspects,the MT role and the DU role of the IAB node 215 may be included withinthe same entity, but may functionally operate as two different entities(for example, the IAB node 215 may use different software ifcommunicating via the MT role than if communicating via the DU role). Insome examples, the MT role of the IAB node 215 may be similar to a roleperformed by the UEs 115 within the IAB network 200. Additionally, insome examples, the IAB node 215 may not be directly connected to awireline backhaul link 220. Instead, the IAB node 215 may connect to thecore network 205 via other IAB nodes 215 (any number of additional IABnodes 215 and the IAB donor node 210) using wireless backhaul links 225.As such, in examples in which the IAB node 215 functions as a relaynode, the IAB node 215 may relay traffic to or from the IAB donor node210 through one or multiple hops, where a quantity of the one ormultiple hops may refer to the number of wireless backhaul links 225connecting the IAB node 215 to the IAB donor node 210.

The DU role of the IAB node 215 may be at least partially controlled bysignaling messages from the CU role of the IAB donor node 210 (forexample, an associated IAB donor node 210). In some examples, suchsignaling messages may be transmitted from the IAB donor node 210 to theIAB node 215 via an F1-application protocol (F1-AP) message.Additionally, the DU role of the IAB node 215 may support a geographiccoverage area 110-a of the IAB network coverage area and may providescheduling information to the UEs 115 and the child IAB nodes 215 withinthe geographic coverage area 110-a. For example, the DU role of the IABnode 215 may perform the same or similar functions as the DU role of theIAB donor node 210 by controlling or scheduling communication over theaccess links 235 between the IAB node 215 and the UEs 115 within thegeographic coverage area 110-a and the wireless backhaul links 225between the IAB node 215 and the downstream IAB nodes 215 within thegeographic coverage area 110-a. As described herein, the IAB node 215may communicate upstream (towards the core network 205) in the IABnetwork 200 using the MT role of the IAB node 215 and may communicatedownstream (towards a UE 115) in the IAB network 200 using the DU roleof the IAB node 215.

In some examples, the IAB network 200 may be an NR-U system and an IABnode 215 may utilize a shared spectrum or an unlicensed spectrum tocommunicate with the IAB donor node 210, one or more other IAB nodes 215(for example, parent IAB nodes 215 or child IAB nodes 215), one or moreUEs 115, or any combination thereof. As such, the IAB node 215 may sharetime and frequency resources with other devices within the IAB network200. The IAB node 215, as a result of utilizing an NR shared spectrum,may support increased spectrum utilization and spectral efficiency,specifically through dynamic vertical (for example, across the frequencydomain) and horizontal (for example, across the time domain) sharing ofresources. In some examples, however, a shared spectrum may becomecongested if multiple devices attempt to transmit over the sharedspectrum simultaneously, which may result in high levels of interferenceand reduce the likelihood for successful communications between devicesin the IAB network 200. For example, if the IAB node 215 attempts totransmit at the same time as another device, the transmission from theIAB node 215 may be adversely influenced by interference generated bythe other device, which may lower the likelihood that a receiving devicewill successfully receive the transmission from the IAB node 215.

To reduce the influence of interference generated by other devices usingthe shared spectrum, the IAB node 215 may perform a channel sensingprocedure prior to transmitting to find or determine whether the sharedchannel is idle (available). Some channel sensing procedures, however,may be sub-optimal for devices that feature or otherwise function indifferent wireless roles. For example, the IAB node 215 may function inthe MT role or in the DU role, or both, at any given time and thedifferent wireless roles may use different communication components ofthe IAB node 215 or different communication parameters that mayinfluence the reliability and accuracy of a channel sensing procedure.For example, in accordance with various design or implementationchoices, the MT role and the DU role of the IAB node 215 may share anantenna panel of the IAB node 215, use different antenna panels of theIAB node 215, use different transmission powers (for example, differentmaximum transmission powers), use different sets of transmit beams andreceive beams, have different radio frequency footprints, share the sameED thresholds, use different ED thresholds, or any combination thereof.In an example, the MT role and the DU role of the IAB node 215 may eachuse different sets of transmit beams and receive beams because the DUrole of the IAB node 215 may serve a wider geographic area than the MTrole, which may be because the DU role of the IAB node 215 may serve arelatively larger number of UEs 115 or child IAB nodes 215 at variouslocations within a geographic coverage area 110-a while the MT role ofthe IAB node 215 may communicate with a relatively smaller number ofcandidate parent IAB nodes 215 with known locations or directions.Additionally, or alternatively, different IAB nodes 215 may havedifferent duplexing capabilities, which may influence the timing of achannel sensing procedure.

In some implementations, the IAB node 215 may account for such potentialvariations as a result of communicating capability and configurationsignaling between the IAB node 215 and a parent IAB node 215 or the IABdonor node 210 (for example, the CU role of the IAB donor node 210). Forexample, the IAB node 215 may report one or more capabilities to aparent IAB node 215 or the CU role of the IAB donor node 210, which mayinclude a sensing capability or a duplexing capability, or both.

In some examples, the sensing capability of the IAB node 215 mayindicate whether the IAB node 215 is capable of performing a channelsensing procedure as a single node or as multiple nodes. For example,the IAB node 215 may operate both the MT role and the DU role of the IABnode 215 as a single entity (for example, the MT role and the DU rolemay share an antenna panel of the IAB node 215) and the IAB node 215 mayinclude, within the sensing capability, an indication that the IAB node215 is capable of performing channel sensing procedures as a singlenode. Performing a channel sensing procedure as a single node may bereferred to herein as a common channel sensing procedure. Alternatively,the IAB node 215 may operate the MT role as a first entity and the DUrole as a second entity (for example, the MT role and the DU role of theIAB node 215 may use different antenna panels of the IAB node 215) andthe IAB node 215 may include, within the sensing capability, anindication that the IAB node 215 is capable of performing channelsensing procedures as multiple nodes. Performing a channel sensingprocedure as multiple nodes may be referred to herein as performing aseparate channel sensing procedure for the MT role and the DU role.

In some implementations, the IAB node 215 may perform a separate channelsensing procedure for the MT role and the DU role. Such use of separatechannel sensing procedures for transmissions via the MT role and fortransmissions via the DU role of the IAB node 215 may result in greaterreliability, such as in examples in which the MT role and the DU role ofthe IAB node use separate antenna panels or otherwise have differentradio frequency footprints—for instance, in examples in which the MTrole and the DU role of the IAB node 215 have sufficiently different(outside a threshold variation) radio frequency footprints.

The radio frequency footprints associated with the MT role and the DUrole of the IAB node 215 may correspond to areas or volumes in whichinterference to a receiver may be great enough to result in higher errorrates or lower likelihoods for successful communications. The IAB node215 may determine the radio frequency footprints associated with the MTrole and the DU role of the IAB node 215 in accordance with a transmitbeam pattern, a transmission power, an ED threshold, or any combinationthereof. As such, in examples in which the MT role and the DU role havedifferent radio frequency footprints, the MT role and the DU role mayuse different transmit beam patterns and or different transmissionpowers, or transmissions via the MT role and the DU role may havedifferent susceptibilities to interference (for example, different EDthresholds may be used for transmissions via the MT role than fortransmissions via the DU role).

In such examples in which the MT role and the DU role have differentradio frequency footprints, the IAB node 215 may perform differentchannel sensing procedures for each wireless role such that the twodifferent channel sensing procedure achieve better alignment with thetwo different radio frequency footprints of the MT role and the DU rolethan a single channel sensing procedure could achieve. For example, theMT role may be associated with a first radio frequency footprint and theDU role may be associated with a second radio frequency footprint andthe first channel sensing procedure may be configured to align with thefirst radio frequency footprint of the MT role while the second channelsensing procedure may be configured to align with the second radiofrequency footprint of the DU role. The area or volume of the radiofrequency footprint associated with a channel sensing procedure may bedetermined using or in accordance with a receive beam pattern, a maximumtransmit power, an ED threshold, or any combination thereof.

As such, the IAB node 215 may align the radio frequency footprintassociated with one of the channel sensing procedures with the radiofrequency footprint associated with one of the wireless roles of the IABnode 215 as a result of using the same or a similar beam pattern toperform the channel sensing procedure as the wireless role uses totransmit, or as a result of adjusting the transmit power or the EDthreshold, or both, in examples in which different beam patterns areused. As such, the IAB node 215 may minimize or avoid an exposed nodeproblem in which an area or volume may be covered by the radio frequencyfootprint of a channel sensing procedure but not by the radio frequencyfootprint of a transmission via the MT role or the DU role, which mayresult in unnecessary blocking of transmissions, and a hidden nodeproblem in which an area or volume may be covered by the radio frequencyfootprint of a transmission via the MT role or the DU role but not bythe radio frequency footprint of a channel sensing procedure, which mayresult in high levels of interference from a node within the area orvolume that may reduce the likelihood for successful transmissions fromthe IAB node 215.

Additionally, or alternatively, the sensing capability of the IAB node215 may indicate whether the IAB node 215 is capable of performingsimultaneous channel sensing procedures. In other words, the sensingcapability of the IAB node 215 may indicate whether the IAB node 215 iscapable of simultaneously sensing one or multiple channels from multipleentities of the IAB node 215. For example, the sensing capability mayindicate whether the IAB node 215 is capable of performing the firstchannel sensing procedure at the same time as the second channel sensingprocedure. Additionally, or alternatively, the sensing capability of theIAB node 215 may indicate whether the IAB node 215 is capable ofperforming a channel sensing procedure for one wireless role whiletransmitting via another wireless role. For example, the IAB node 215may include, within the sensing capability, an indication of whether theIAB node 215 is capable of performing the first channel sensingprocedure for a transmission via the MT role while simultaneouslytransmitting via the DU role or capable of performing the second channelsensing procedure for a transmission via the DU role whilesimultaneously transmitting via the MT role. Additionally, oralternatively, the sensing capability may include an indication ofwhether the IAB node 215 is capable of shifting the timing of a sensingslot by a gap to offset the sensing slot from a correspondingtransmission.

In some implementations, the IAB node 215 may transmit the sensingcapability to a parent IAB node 215 or the CU role of the IAB donor node210 in a message signaled via an F1-AP interface, via an RRC interface,via a MAC-CE, or any combination thereof. For example, the IAB node 215may transmit or otherwise output the sensing capability of the IAB node215 as one or more of an F1-AP message, an RRC message, or a MAC-CE. TheIAB node 215 may additionally, or alternatively, transmit a duplexingcapability to a parent IAB node 215 or the CU role of the IAB donor node210 to indicate whether the IAB node 215 is capable of TDM upstream anddownstream communications, space-division multiplexing (SDM)simultaneous reception, SDM simultaneous transmission, or full-duplexcommunications. Example duplexing capabilities of the IAB node 215 aredescribed in more detail herein, for example, with reference to FIG. 3 .In some examples, the duplexing capability of the IAB node 215 mayinfluence a timing of a sensing slot for performing a channel sensingprocedure. The IAB node 215 may transmit the duplexing capability to aparent IAB node 215 or the CU role of the IAB donor node 210 along withor separately from transmitting the sensing capability and, in someimplementations, may transmit or otherwise output the duplexingcapability as one or more of an F1-AP message, an RRC message, or aMAC-CE.

The parent IAB node 215 or the IAB donor node 210 may receive thesensing capability or the duplexing capability, or both, and may selector otherwise determine a configuration of the channel sensing procedureof the IAB node 215 in accordance with the sensing capability or theduplexing capability, or both. In some examples, the configuration ofthe channel sensing procedures may indicate a type of channel sensingprocedure that the IAB node 215 may use. For example, the IAB node 215may perform a type 1 (type1) channel sensing procedure, a type 2A(type2A) channel sensing procedure, or a type 2B (type2B) channelsensing procedure. Additional details relating to the type of channelsensing procedure are described herein, for example, with reference toFIG. 4 . Additionally, the configuration of the channel sensingprocedure may indicate whether the IAB node 215 will perform a commonchannel sensing procedure for transmissions via the MT role and the DUrole or whether the IAB node 215 will perform separate channel sensingprocedures for transmissions via the MT role and the DU role. In someimplementations, the configuration may indicate that the IAB node 215will perform separate channel sensing procedures for transmissions viathe MT role and for transmissions via the DU role.

The configuration of the channel sensing procedure also may includeinformation relating to a timing of a sensing slot for performing thechannel sensing procedure (for example, timing information of separatesensing slots for performing separate channel sensing procedures).Additional details relating to the timing of separate channel sensingprocedures are described herein, for example, with reference to FIG. 5 .Additionally, or alternatively, the configuration of the channel sensingprocedure may indicate whether the IAB node 215 may use a filler signalto align a transmission timing of a transmission via the MT role with atransmission timing of a transmission via the DU role. For instance, inexamples in which the IAB node 215 is capable of simultaneouslytransmitting via the MT role and the DU role and in which thetransmissions via the MT role and the DU role are not aligned in time(for example, offset by some time gap), the configuration of the channelsensing procedure may indicate the IAB node 215 to apply a filler signalto align the transmissions via the MT role and the DU role in time.Additional details relating to the application of a filler signal toalign different transmissions via the MT role and the DU role in timeare described herein, for example, with reference to FIG. 6 .

In some examples, the configuration for the channel sensing procedure ofthe IAB node 215 may be pre-configured or pre-defined, such as in aspecification, in accordance with the capabilities of the IAB node 215.Additionally, or alternatively, the parent IAB node 215 or the IAB donornode 210 may transmit an indication of the channel sensing procedureconfiguration to the IAB node 215. For instance, in examples in whichthe parent IAB node 215 configures the channel sensing procedure for theIAB node 215, the parent IAB node 215 may transmit the indication via aMAC-CE or via DCI. In examples in which the IAB donor node 210configures the channel sensing procedure for the IAB node 215 via the CUrole of the IAB donor node 210, the IAB donor node 210 may transmit theindication via the F1-AP interface (via an F1-AP message) or via the RRCinterface (via an RRC message).

In some implementations, the configuration of the channel sensingprocedure may be received via a ChannelAccessConfig-r16 field, which bean RRC field or an RRC information element including a list ofparameters used for shared spectrum channel sensing procedures. Forexample, the ChannelAccessConfig-r16 field may include amaxEnergyDetectionThreshold-r16 parameter that indicates a maximum EDthreshold, an energyDetectionThresholdOffset-r16 parameter thatindicates an offset relative to a default ED threshold (such as adefault maximum ED threshold), an ul-toDL-COT-SharingED-Threshold-r16parameter that indicates a maximum ED threshold that the IAB node 215may use to share a COT with the IAB donor node 210 or a parent IAB node215, and an absenceOfAnyOtherTechnology-r16 parameter that indicates apotential presence or an absence of any other technology sharing thecarrier used by the IAB node 215. At a base station 105 side or a DUrole of an IAB node 215, the upper limit for an ED threshold may bedetermined using a formula, such as defined by a specification, and themax ED threshold may be a function of maximum transmission power,bandwidth, existence of other technology for sharing the channel, or anycombination thereof. At a UE 115 side or an MT role of the IAB node 215,the upper limit for an ED threshold may be configured as an absolutevalue via maxEnergyDetectionThreshold-r16 or as an offset value viaenergyDetectionThresholdOffset-r16. In examples in which the upper limitfor the ED threshold is not configured, the UE 115 or the MT role of theIAB node 215 may determine the upper limit for the ED threshold using aformula similar to the formula used at the base station 105 side or atthe DU role of the IAB node 215.

In some examples, the IAB node 215 may receive or be configured with anED threshold, which also may be referred to herein as a value or an EDthreshold value, of a channel sensing procedure. For example, the CUrole of the IAB donor node 210 may configure the ED threshold via anF1-AP interface (via an F1-AP message) or via an RRC interface (via anRRC message) or a parent IAB node 215 may indicate the ED thresholdvalue to the IAB node 215 via a MAC-CE or DCI. In some examples, the IABnode 215 may receive an indication of the ED threshold via one of theparameters in the ChannelAccessConfig-r16 field. In someimplementations, the signaling from the IAB donor node 210 or the parentIAB node 215 may indicate a first ED threshold that the IAB node 215 mayuse for performing the first channel sensing procedure and a second EDthreshold that the IAB node 215 may use for performing the secondchannel sensing procedure. Additionally, or alternatively, a configuredor indicated ED threshold may be associated with a set of sensing beamsor a set of beam pairs (for example, a set of unique pairs of sensingbeams and transmit beams) and the IAB node 215 may use the ED thresholdwhen performing a channel sensing procedure using an associated set ofsensing beams or an associated set of beam pairs. For example, a firstED threshold may be associated with a first set of sensing beams and asecond ED threshold may be associated with a second set of sensingbeams. In such examples, the IAB node 215 may use the first ED thresholdfor performing the first channel sensing procedure if the first channelsensing procedure uses the first set of sensing beams and the IAB node215 may use the second ED threshold for performing the second channelsensing procedure if the second channel sensing procedure uses thesecond set of sensing beams.

Additionally, or alternatively, the ED threshold may be configured orotherwise determined in accordance with whether the IAB node 215 isperforming a channel sensing procedure while simultaneouslytransmitting. For example, the IAB node 215 may be configured with afirst ED threshold that the IAB node 215 may use if performing a channelsensing procedure (either the first channel sensing procedure or thesecond channel sensing procedure) in the presence of transmissions viaanother wireless role (for example, either the MT role or the DU role)of the IAB node 215 and may be configured with a second ED thresholdthat the IAB node 215 may use if performing the channel sensingprocedure in the absence of transmissions from the IAB node 215. In someexamples, the first ED threshold that the IAB node 215 may use forperforming the channel sensing procedure while transmitting may have alarger value than the second ED threshold that the IAB node 215 may usefor performing the channel sensing procedure in the absence oftransmissions from the IAB node 215 (for example, the first ED thresholdmay be a less strict threshold than the second ED threshold). The IABnode 215 may select the first ED threshold or the second ED threshold inaccordance with whether the IAB node 215 is scheduled to be transmittingwhile performing the channel sensing procedure.

In some examples, an ED threshold may be received or configured at theIAB node 215 as an absolute value. For example, signaling indicating orconfiguring an ED threshold at the IAB node 215 may include a number ofbits (such as a bit stream) corresponding to the absolute value (thecomplete value) of the ED threshold. In some other examples, an EDthreshold may be indicated to or configured at the IAB node 215 as anoffset value relative to a default value (for example, a default valueas defined by a specification) or as an offset value relative to anindicated parameter. For example, the IAB node 215 may be configuredwith or otherwise determine a default value and the signaling to the IABnode 215 (from either the IAB donor node 210 or a parent IAB node 215)may indicate an offset value relative to the default value. In suchexamples, the IAB node 215 may calculate or otherwise determine the EDthreshold using the default value and the offset value. For example, theIAB node 215 may add, subtract, or perform any other mathematicaloperation including the default value and the offset value to calculateor otherwise determine the ED threshold. In some implementations, thedefault value may be a default ED threshold. Additionally, oralternatively, the IAB node 215 may receive an indication of a parameterand the offset value (from either of the IAB donor node 210 or a parentIAB node 215) and the IAB node 215 may calculate or otherwise determinethe ED threshold using the indicated parameter and the offset value. Theindicated parameter may be any communication parameter and may beexplicitly or implicitly signaled to the IAB node 215.

In some other examples, the IAB node 215 may determine an ED thresholdwithout receiving additional signaling from another device (from eitherof the IAB donor node 210 or a parent IAB node 215). In such examples,the IAB node 215 may determine the ED threshold using a formula, such asa formula defined in a specification. In some implementations, the IABnode 215 (a device in a wireless backhaul network) may use a formula todetermine the ED threshold in a similar manner as a device in an accessnetwork may determine the ED threshold (for example, as defined in anNR-U specification). Additionally, or alternatively, the IAB node 215may determine the ED threshold as a result of using a number of rules orformulas, or both, that correspond (for example, account for) the classof the wireless roles of the IAB node 215. For example, the IAB node 215may determine a first ED threshold for the first channel sensingprocedure in accordance with a class of the MT role and may determine asecond ED threshold for the second channel sensing procedure inaccordance with a class of the DU role. In some examples, the class ofthe MT role may include a wide-area class or a local-area class.

As such, the IAB node 215 may receive an indication or otherwise selector determine the configuration of the separate channel sensingprocedures and the ED thresholds and may perform the separate channelsensing procedures accordingly. For example, the IAB node 215 maymeasure an energy, which may be referred to herein as an ED value, of achannel during a first channel sensing procedure in a measurement areaof a first sensing slot and initiate a COT for a transmission via the MTrole in accordance with whether the measured energy satisfies (forexample, is less than or equal to) a first ED threshold. Similarly, theIAB node 215 may measure an energy of a channel during a second channelsensing procedure in a measurement area of a second sensing slot andinitiate a COT for a transmission via the DU role as a result ofdetermining whether the measured energy satisfies a second ED threshold.

FIG. 3 illustrates example IAB networks 300, 301, and 302 that supportchannel sensing procedures for communications at an IAB node. In someexamples, the IAB networks 300, 301, and 302 may implement aspects ofthe wireless communications system 100 or the IAB network 200. The IABnetworks 300, 301, and 302 illustrate examples of different duplexingcapabilities of an IAB node 310, which may be an example ofcorresponding devices described with reference to FIGS. 1 and 2 , suchas an IAB node 215 as described with reference to FIG. 2 .

The IAB node 310 may feature a duplexing capability and, in someimplementations, may transmit an indication of the duplexing capabilityto a parent node 305, which may be an example of a parent IAB node 215or an IAB donor node 210 as described with reference to FIG. 2 . In someexamples, the IAB node 310 may be configured with or otherwise receivean indication of a configuration for performing separate channel sensingprocedures for transmissions via an MT role and for transmissions via aDU role in accordance with the duplexing capability of the IAB node 310.The IAB node 310 may support TDM communication techniques betweencommunications over wireless backhaul link 320 and child links 325(which may be examples of access links) or may support different duplexcapabilities (for example, enhanced duplex capabilities), such ashalf-duplex SDM for simultaneous reception or simultaneous transmissionor full-duplex SDM for simultaneous transmission and reception.

In the IAB network 300, an IAB node 310-a may establish an MT role and aDU role and may communicate with a parent node 305-a over a wirelessbackhaul link 320 via the MT role of the IAB node 310-a and maycommunicate with a child node 315-a and a UE 115-a over child links 325via the DU role of the IAB node 310-a. In some examples, the IAB node310-a may support a half-duplex SDM capability and, as such, may receivemultiple signals simultaneously. For example, the IAB node 310-a maysimultaneously receive signaling from the child node 315-a and the UE115-a over the child links 325 and signaling from the parent node 305-aover the wireless backhaul link 320.

In the IAB network 301, an IAB node 310-b may establish an MT role and aDU role and may communicate with a parent node 305-b over a wirelessbackhaul link 320 via the MT role of the IAB node 310-b and maycommunicate with a child node 315-b and a UE 115-b over child links 325via the DU role of the IAB node 310-b. In some examples, the IAB node310-b may support a half-duplex SDM capability and, as such, maytransmit multiple signals simultaneously. For example, the IAB node310-b may simultaneously transmit signaling (for example, downstreamcommunication) to the child node 315-b or the UE 115-b over the childlinks 325 via the DU role of the IAB node 310-b and may transmitsignaling (for example, upstream communications) to the parent node305-b over the wireless backhaul link 320 via the MT role of the IABnode 310-b. In some implementations, the IAB node 310-b may performseparate channel sensing procedures prior to transmitting via the MTrole and the DU role. Additional details relating to performing theseparate channel sensing procedures are described herein, for example,with reference to FIGS. 2 and 5 .

In the IAB network 302, an IAB node 310-c may establish an MT role and aDU role and may communicate with a parent node 305-c over a wirelessbackhaul link 320 via the MT role of the IAB node 310-c and maycommunicate with a child node 315-c and a UE 115-c over child links 325via the DU role of the IAB node 310-c. In some examples, the IAB node310-c may support a full-duplex SDM capability and, as such, maytransmit and receive multiple signals simultaneously. For example, theIAB node 310-c may simultaneously transmit and receive signaling to andfrom the child node 315-c or the UE 115-c over the child links 325 viathe DU role of the IAB node 310-c and may simultaneously transmit andreceive signaling to and from the parent node 305-c over the wirelessbackhaul link 320 via the MT role of the IAB node 310-c. In someimplementations, the IAB node 310-c may perform separate channel sensingprocedures prior to transmitting via the MT role and the DU role.Additional details relating to performing the separate channel sensingprocedures are described herein, for example, with reference to FIGS. 2and 5 .

FIG. 4 illustrates example channel sensing configurations 400, 401, and402 that support channel sensing procedures for communications at an IABnode. In some examples, the channel sensing configurations 400, 401, and402 may implement aspects of the wireless communications system 100 orthe IAB network 200. The channel sensing configurations 400, 401, and402 illustrate example channel sensing configurations that a wirelessnode, which may be an example of an IAB node as described with referenceto FIGS. 1-3 , may use to perform separate channel sensing proceduresfor transmissions via an MT role and a DU role of the IAB node.

The channel sensing configuration 400 illustrates an example of a type1channel sensing procedure that the wireless node may implement to gainaccess and to initiate a COT 425 (for example, in an NR-U sharedspectrum). A type1 channel sensing procedure, which may be equivalentlyreferred to as a type1 channel access procedure, may include a randomnumber of slots N that the wireless node may sense (for example, arandom number of slots N that the wireless node may measure an energy ofa channel during). For example, the wireless node may identify that achannel is busy during a time period 405 and may perform the type1channel sensing procedure upon the expiration of the time period 405 andone or more defer periods 410. A defer period 410 may include a slot 415and a number of slots 420. The wireless node may select or otherwisedetermine the number (the quantity) of slots 420 in the defer period 410in accordance with a parameter, such as an m_(p) parameter. For example,the wireless node may use the m_(p) parameter to select or determine anumber of slots 420 that may follow a slot 415. As illustrated in thechannel sensing configuration 400, m_(p) may be equal to 3 and, as such,three slots 420 may follow the slot 415. In some examples, the slot 415may span a time duration equal to 16 microseconds and a slot 420 mayspan a time duration equal to a basic sensing unit of time, which may beequal to 9 microseconds. As such, in examples in which m_(p) is equal to3, the defer period 410 may span a time duration equal to 43microseconds (16+m_(p)*9=16+3*9=43).

Upon expiration of the defer period 410, the wireless node may sense arandom number (which may be denoted as N, where N≥0) of sensing slotsthat are found, sensed, or otherwise determined to be idle prior totransmitting. In some examples, each of the sensing slots that thewireless node may sense may include a measurement area 430. Each of thesensing slots may span a time duration equal to the basic sensing unitof time, which may be equal to 9 microseconds, and each measurement area430 within a sensing slot may span a time duration of at least 4microseconds. The wireless node may maintain a counter initially set toN when performing a type1 channel sensing procedure and may reduce thecounter by one for each sensing slot that the wireless node senses to beidle. For example, the wireless node may measure an energy of thechannel during the measurement area 430 in a sensing slot and reduce thecounter by one if the measured energy satisfies an ED threshold. Inexamples in which the measured energy fails to satisfy the ED threshold,the wireless node may determine that the sensing slot is busy and holdthe counter at its existing value, wait another defer period 410 afterthe sensing slot that was determined to be busy, and continue thechannel sensing procedure in sensing slots after the defer period 410.In such examples, the wireless node may continue reducing the counter byone for each sensing slot that is measured to be idle and waiting otherdefer periods 410 if other sensing slots are measured to be busy beforethe counter reaches zero.

Once the counter at the wireless node reaches zero, the wireless nodewill have sensed a total of N sensing slots to be idle and, in someexamples, completed the type1 channel sensing procedure and may transmitat the next scheduled or allocated transmission occasion. In examples inwhich the counter reaches zero before the next scheduled or allocatedtransmission occasion (for example, if there is a time gap between theN^(th) idle sensing slot and the next scheduled or allocatedtransmission occasion), the behavior of the wireless node may vary. Insome examples, the wireless node may hold the counter value at zero andperform channel sensing in a sensing slot prior (such as immediatelyprior, so that the sensing slot is aligned with the beginning of thescheduled or allocated transmission occasion) to the next scheduled orallocated transmission occasion and may transmit at the scheduled orallocated occasion if the sensing slot is sensed to be idle. In someother examples, the wireless node may keep sensing the channel after thecounter reaches zero and may decrease the value of the counter past zero(to negative values) for each idle slot sensed. In such examples, thewireless node may transmit at the scheduled or allocated occasion if thecounter value is less than or equal to zero. If the wireless devicesenses a slot to be busy when the counter is at zero, the wireless nodemay restart the type1 channel sensing procedure (for example, with anewly generated random number N for the counter).

In examples in which the wireless node is an example of an IAB node andmeasures an energy of the channel that satisfies an ED threshold of afirst channel sensing procedure in a total of N sensing slots (such thatthe counter is less than or equal to zero), the IAB node may initiate aCOT 425-a and transmit via he MT role or the DU role, or both. In someexamples, a type1 channel sensing procedure may be used by the wirelessnode (for example, the IAB node), a parent node, a child node, a UE 115,or a base station 105 to initiate a COT 425-a. A duration of the COT425-a initiated for transmissions via the MT role or the DU role, orboth, of the wireless node may be less than or equal to a maximum COTassociated with the priority class of the transmissions (the traffic)from the wireless node. The priority class may be equivalently referredto as a channel access priority class (CAPC), may be denoted by thesymbol p, and may be described with reference to Table 1.

TABLE 1 CAPC Allowed (p) m_(p) CW_(min, p) CW_(max, p) T_(mcot, p)CW_(p) Sizes 1 1 3 7 2 ms {3, 7} 2 1 7 15 3 ms {7, 15} 3 3 15 63 8 or 10ms {15, 31, 63} 4 7 15 1023 8 or 10 ms {15, 31, 63, 127, 255, 511, 1023}

Table 1 shows examples of various parameters that may be associated withthe CAPC for a type1 channel sensing procedure for a downlink or anuplink transmission. As shown by Table 1, the wireless node may usedifferent parameters in accordance with the class of the traffic via theMT role or the DU role to determine the configuration of a type1 channelsensing procedure. For example, the wireless node may use the parametersCW_(min,p) and CW_(max,p) to select a lower limit and an upper limit,respectively, of a contention window (CW) that the wireless node may usefor performing a type1 channel sensing procedure. The CW may include alist of values, as shown by the CW_(p) Sizes column, from which thewireless node may select (for example, randomly select) a value to setas the counter. For example, the wireless node may select, calculate, ordetermine N as a result of randomly selecting (via a random numbergenerator) a value from CW_(p) Sizes. The wireless node may use theparameter T_(mcot,p) to select or determine how long the wireless nodemay hold a COT after or as a result of passing the type1 channel sensingprocedure.

The channel sensing configurations 401 and 402 illustrate examples oftype2 channel sensing procedures that a wireless node may implement togain access and to initiate a COT 425 (for example, in an NR-U sharedspectrum). For example, the channel sensing configuration 401 mayillustrate an example of a type2A channel sensing procedure, which maybe equivalently referred to as a type2A channel access procedure, andthe channel sensing configuration 402 may illustrate an example of atype2B channel sensing procedure, which may be equivalently referred toas a typ2B channel access procedure. In some examples, a type2 channelsensing procedure may be used by the wireless node, a parent node, or abase station 105 to initiate a COT 425 for transmissions of discoverysignals. Additionally, or alternatively, a type2 channel sensingprocedure may be used by the wireless node, a parent node, a child node,a base station 105, or a UE 115 to send transmissions after a time gapwithin a previously initiated COT 425 or a shared COT 425. In suchexamples, the wireless node, the parent node, the child node, the basestation 105, or the UE 115 may perform a relatively lower-latencychannel sensing procedure (as compared to a type1 channel sensingprocedure) to access a channel within a previously initiated COT 425.The parameter ULtoDL-CO-SharingED-Threshold-r16 may indicate the upperlimit ED threshold (the maximum ED threshold) that may be used to allowa wireless node-initiated or a UE-initiated COT to be shared with aparent wireless node or a base station 105. The parameterULtoDL-CO-SharingED-Threshold-r16 may be configured by a parent wirelessnode or a base station 105 in accordance with the transmission power(for example, the maximum transmission power) of the wireless node, theparent wireless node, or the base station 105.

A type2A channel sensing procedure, as illustrated in the channelsensing configuration 401, may enable the wireless node to transmitsignaling as a result of sensing a channel to be idle (for example, as aresult of calculating or determining that a measured energy satisfies anED threshold) for a deterministic time period. For example, the channelsensing configuration 401 may illustrate a channel sensing procedurehaving a duration of 25 microseconds. Such a channel sensing proceduremay be used by the wireless node in examples in which a time gap betweenswitching from downlink to uplink is greater than or equal to 25microseconds and when a gap between switching from uplink to downlink isequal to 25 microseconds.

The channel sensing configuration 401 may use two sensing slots 440including a sensing slot 440-a at the beginning of the channel sensingconfiguration 401 and a sensing slot 440-b at the end of the channelsensing configuration 401. Each sensing slot 440 may include ameasurement area 435 during which the wireless node may measure anenergy of the channel. For example, the sensing slot 440-a may include ameasurement area 435-a and the sensing slot 440-b may include ameasurement area 435-b, and the wireless node may perform the type2Achannel sensing procedure by measuring an energy of the channel duringthe measurement area 435-a and the measurement area 435-b. In examplesin which the measured energy satisfies an ED threshold of a channelsensing procedure in both the measurement area 435-a and the measurementarea 435-b, the wireless node may determine that the channel is idle(for example, available) and may initiate a COT 425-b. In some examples,the sensing slot 440-a and the sensing slot 440-b may span timedurations equal to the basic sensing unit of time, which may be equal to9 microseconds, and the measurement area 435-a and the measurement area435-b may span time durations equal to 4 microseconds.

A type2B channel sensing procedure, as illustrated in the channelsensing configuration 402, may enable the wireless node to transmitsignaling as a result of sensing a channel to be idle (for example, as aresult of calculating or determining that a measured energy satisfies anED threshold) for a deterministic time period. For example, the channelsensing configuration 402 may illustrate a channel sensing procedurehaving a duration of 16 microseconds. Such a channel sensing proceduremay be used by the wireless node in examples in which a time gap betweenswitching from downlink to uplink, switching from uplink to uplink,switching from uplink to downlink, or switching from downlink todownlink is equal to 16 microseconds.

The channel sensing configuration 402 may include one sensing slot 450at the end of the channel sensing configuration 402 and a measurementarea 445. In some examples, the sensing slot 450 may include at least afirst portion of the measurement area 445 equal to a time duration of455, while a second portion of the measurement area 445 may, in someimplementations, be outside of the sensing slot 450. For example, thesensing slot 450 may span a time duration equal to the basic sensingunit of time, which may be equal to 9 microseconds, and may include atleast 4 microseconds of the measurement area 445 (for example, the timeduration 455 may equal at least 4 microseconds). In some examples, themeasurement area 445 may span a time duration equal to 5 microseconds.The wireless node may measure an energy of the channel during themeasurement area 445 that is included within the sensing slot 450 as aresult of performing the type2B channel sensing procedure and initiate aCOT 425-c if whether the measured energy satisfies an ED threshold of achannel sensing procedure. In examples in which the measured energysatisfies the ED threshold, the wireless node may initiate the COT425-c.

In some examples, the wireless node may perform a type2C channel sensingprocedure, which may be equivalently referred to as a type2C channelaccess procedure, and may refrain from performing any channel sensingprior to transmitting any transmissions via either the MT role or the DUrole, or both, in examples in which the wireless node is an IAB node.The IAB node may perform a type2C channel sensing procedure in examplesin which a time gap between switching from downlink to uplink, switchingfrom uplink to uplink, switching from uplink to downlink, or switchingfrom downlink to downlink is less or equal to 16 microseconds and thetransmissions via either the MT role or the DU role, or both, are lessthan a threshold time duration (for example, less than 584microseconds).

In examples in which the wireless node performs a type1, a type2A, or atype2B channel sensing procedure, the wireless node may measure anenergy of a channel in at least one sensing slot including a measurementarea prior to transmitting. For example, type1, type2A, and type2Bchannel sensing procedures may include different numbers of sensingslots or span different total durations, but the last sensing slot (forexample, the sensing slot latest in time or the sensing slot that isaligned with the COT 425) of each type of channel sensing procedure maybe common across the three types of channel sensing procedures. Forinstance, the sensing slot that is aligned with the COT 425 for eachtype of channel sensing procedure may be a sensing slot of 9microseconds and include at least four microseconds of a measurementarea during which the wireless node may sense the channel. Such finalsensing slots that are common to the three types of channel sensingprocedures also may include a time gap T1 between the measurement areaof the sensing slot and the beginning of the COT 425. In some examples,the time gap T1 may be a time gap to provide node processing time andmay include sufficient time for the wireless node to switch from sensingto transmitting.

In some implementations, the wireless node may select or determine atiming of the separate channel sensing procedures (which may include anycombination of a type1, a type2A, or a type2B channel sensing procedure)in accordance with the sensing capability and the duplexing capabilityof the wireless node. Additional details relating to the timing of theseparate channel sensing procedures are described herein, for example,with reference to FIG. 5 .

FIG. 5 illustrates example communications timelines 500, 501, 502, 503,and 504 that support channel sensing procedures for communications at anIAB node. In some examples, the communications timelines 500, 501, 502,503, and 504 may implement aspects of the wireless communications system100 or the IAB network 200. In some implementations, an IAB node 530,which may be an example of corresponding devices as described withreference to FIGS. 1-4 , may perform separate channel sensing proceduresto initiate a COT for transmissions via the MT role and the DU role ofthe IAB node.

The IAB node 530 may support various timing options for transmitting viathe MT role and the DU role of the IAB node 530. In some examples, anIAB network including the IAB node 530 may support a baseline timingoption in which transmissions via the DU role of IAB nodes 530 in theIAB network are aligned in time and in which transmissions via the MTrole of IAB nodes 530 within the IAB network are controlled by the DUrole of a parent node. For example, the DU role of a parent node maycontrol transmissions via the MT role of a child node using a timingadvance (TA) framework. In examples in which the IAB node 530 usesbaseline timing, a transmission via the MT role of the IAB node 530(which may be referred to as an MT transmission 505) may be offset intime from a transmission via the DU role of the IAB node 530 (which maybe referred to as a DU transmission 510).

In some implementations, aligned MT transmissions 505 and DUtransmissions 510 may experience reduced self-interference. For example,aligned transmissions may reduce the interference that a transmissionvia one wireless role may cause during a channel sensing procedure atanother wireless role. As such, the IAB node 530 may use aligned MTtransmissions 505 and DU transmissions 510 in examples in which an MTtransmission 505 is likely to interfere with a DU transmission 510 and,alternatively, the IAB node 530 may use baseline timing (in which an MTtransmission 505 may be offset in time from a DU transmission 510) inexamples in which an MT transmission 505 is unlikely to interfere with aDU transmission 510. For example, the IAB node 530 may use baselinetiming in examples in which the IAB node 530 transmits an MTtransmission 505 and a DU transmission 510 using separate antenna panelsthat are sufficiently isolated from each other.

As shown in the communications timeline 500, an IAB node 530-a may bescheduled to transmit an MT transmission 505-a and a DU transmission510-a and may use a baseline timing option. As such, the MT transmission505-a may be offset in time from the DU transmission 510-a. For example,the MT transmission 505-a may precede the DU transmission 510-a by atime gap T3, which may be calculated or determined using the TA of theIAB node 530-a and a T_delta parameter. For instance, T3 may be definedas T3=TA/2+T_delta.

In some examples, the MT transmission 505-a may be associated with asensing slot 515-a during which the IAB node 530-a may perform a firstchannel sensing procedure and the DU transmission 510-a may beassociated with a sensing slot 520-a during which the IAB node 530-a mayperform a second channel sensing procedure. The sensing slot 515-a andthe sensing slot 520-a may be examples of a last sensing slot (forexample, the sensing slot latest in time or the sensing slot alignedwith the beginning of a COT) of a type1, a type2A, or a type2B channelsensing procedure, as described in more detail with reference to FIG. 4. The sensing slot 515-a and the sensing slot 520-a may each includemeasurement areas 535 during which the IAB node 530-a may measure anenergy of the channel.

In some implementations, the IAB node 530-a may be capable ofsimultaneously transmitting the MT transmission 505-a and the DUtransmission 510-a and may either have a sensing capability or may havebeen configured such that the IAB node 530-a may perform a channelsensing procedure while simultaneously transmitting. For example, theIAB node 530-a may be capable of performing the second channel sensingduring a measurement area 535 of the sensing slot 520-a that overlaps intime with the MT transmission 505-a. In such examples, the IAB node530-a may determine the timing of the sensing slot 515-a for performingthe first channel sensing procedure as a result of aligning the sensingslot 515-a with the MT transmission 505-a and the IAB node 530-a maydetermine the timing of the sensing slot 520-a for performing the secondchannel sensing procedure as a result of aligning the sensing slot 520-awith the DU transmission 510-a.

In some implementations, the IAB node 530-a may be capable of performingthe second channel sensing procedure while transmitting the MTtransmission 505-a by applying a signal processing technique to thesensing slot 520-a when the IAB node 530-a is transmitting the MTtransmission 505-a. In some examples, the signal processing techniquemay cancel or reduce the interference experienced while performing thesecond channel sensing procedure while simultaneously transmitting theMT transmission 505-a. In some other implementations, the IAB node 530-amay be capable of performing the second channel sensing procedure whiletransmitting the MT transmission 505-a as a result of measuring orotherwise determining that the IAB node 530-a satisfies an interferencemetric. For example, the IAB node 530-a may measure or determine thatthe antenna panel used by the MT role may be sufficiently isolated bytime separation, frequency separation, or spatial separation, or anycombination thereof, from the antenna panel used by the DU role.

As shown in the communications timeline 501, an IAB node 530-b may bescheduled to transmit an MT transmission 505-b and a DU transmission510-b and may use a baseline timing option. As such, the MT transmission505-b may be offset in time from the DU transmission 510-b. For example,the MT transmission 505-b may precede the DU transmission 510-b by atime gap T3. In some examples, the MT transmission 505-b may beassociated with a sensing slot 515-b during which the IAB node 530-b mayperform a first channel sensing procedure and the DU transmission 510-bmay be associated with a sensing slot 520-b during which the IAB node530-b may perform a second channel sensing procedure. The sensing slot515-b and the sensing slot 520-b may be examples of a last sensing slot(for example, the sensing slot latest in time or the sensing slotaligned with the beginning of a COT) of a type1, a type2A, or a type2Bchannel sensing procedure, as described in more detail with reference toFIG. 4 . The sensing slot 515-b and the sensing slot 520-b may eachinclude measurement areas 535 during which the IAB node 530-b maymeasure an energy of the channel.

In some implementations, the IAB node 530-b may be capable ofsimultaneously transmitting the MT transmission 505-b and the DUtransmission 510-b and may either have a sensing capability or may havebeen configured such that the IAB node 530-b may avoid performing achannel sensing procedure while simultaneously transmitting. Forexample, the IAB node 530-b may be incapable of performing the secondchannel sensing during a measurement area 535 of the sensing slot 520-bthat overlaps in time with the MT transmission 505-b. As such, the IABnode 530-b may offset the sensing slot 520-b from the DU transmission510-b by a gap 525 (for example, a time gap) such that the measurementarea 535 of the sensing slot 520-b does not overlap in time with the MTtransmission 505-b. Accordingly, the IAB node 530-b may select,configure, or otherwise determine a timing of the sensing slot 515-b forperforming the first channel sensing procedure as a result of aligningthe sensing slot 515-b with the MT transmission 505-b and the IAB node530-b may select, configure, or otherwise determine a timing of thesensing slot 520-b for performing the second channel sensing procedurein accordance with the DU transmission 510-b and the gap 525 such thatthe sensing slot 520-b is offset from the DU transmission 510-b.

In some examples, the IAB node 530-b may select or determine to offsetthe sensing slot 520-b from the DU transmission 510-b as a result ofmeasuring or otherwise determining that the IAB node 530-b fails tosatisfy an interference metric. For example, the IAB node 530-b maymeasure or determine that the antenna panel used by the MT role and theantenna panel used by the DU role are not sufficiently isolated and thattransmissions from one of the MT role or the DU role may causeinterference at the other wireless role. In some implementations, theIAB node 530-b may select or determine to offset the sensing slot 520-bfrom the DU transmission 510-b if T3 is less than or equal to athreshold.

As shown in the communications timeline 502, an IAB node 530-c may bescheduled to transmit an MT transmission 505-c and a DU transmission510-c and may use a baseline timing option. As such, the MT transmission505-c may be offset in time from the DU transmission 510-c. For example,the MT transmission 505-c may precede the DU transmission 510-c by atime gap T3. In some examples, the MT transmission 505-c may beassociated with a sensing slot 515-c during which the IAB node 530-c mayperform a first channel sensing procedure and the DU transmission 510-cmay not be associated with a sensing slot 520-c during which the IABnode 530-c may perform a second channel sensing procedure. For example,the IAB node 530-c may perform the first channel sensing procedureduring the sensing slot 515-c and may refrain from performing the secondchannel sensing procedure during a sensing slot 520-c (for example, thesensing slot 520-c may be empty of a channel sensing procedure). In someimplementations, the IAB node 530-c may refrain from performing thesecond channel sensing procedure for the DU transmission 510-c if T3 isless than a threshold time duration or if the DU transmission 510-cspans less than a threshold time duration (for example, less than 584microseconds), or both.

The sensing slot 515-c may be an example of a last sensing slot (forexample, the sensing slot latest in time or the sensing slot alignedwith the beginning of a COT) of a type1, a type2A, or a type2B channelsensing procedure, as described in more detail with reference to FIG. 4, and the empty sensing slot 520-c may be an example of a sensing slotof a type2C channel sensing procedure. The sensing slot 515-c mayinclude a measurement area 535 during which the IAB node 530-c maymeasure an energy of the channel.

As shown in the communications timeline 503, an IAB node 530-d may bescheduled to transmit an MT transmission 505-d and a DU transmission510-d and may use a baseline timing option. As such, the MT transmission505-d may be offset in time from the DU transmission 510-d. For example,the MT transmission 505-d may precede the DU transmission 510-d by atime gap T3. In some examples, the MT transmission 505-d may beassociated with a sensing slot 515-d during which the IAB node 530-d mayperform a first channel sensing procedure and the DU transmission 510-dmay be associated with a sensing slot 520-d during which the IAB node530-d may perform a second channel sensing procedure. The sensing slot515-d and the sensing slot 520-d may be examples of a last sensing slot(for example, the sensing slot latest in time or the sensing slotaligned with the beginning of a COT) of a type2A or a type2B channelsensing procedure, as described in more detail with reference to FIG. 4. The sensing slot 515-d and the sensing slot 520-d may each includemeasurement areas 535 during which the IAB node 530-d may measure anenergy of the channel.

In some implementations, the IAB node 530-d may adjust the timing of themeasurement area 535 within a sensing slot in addition, or as analternative, to adjusting the timing of the sensing slot. For example,the IAB node 530-d may modify the measurement area 535 within thesensing slot 520-d such that the IAB node 530-d may perform the secondchannel sensing procedure during the measurement area 535 of the sensingslot 520-d without interference from the MT transmission 505-d andwithout changing the alignment of the sensing slot 520-d with the DUtransmission 510-d. In some examples, the IAB node 530-d may adjust themeasurement area 535 within the sensing slot 520-d such that less than 4microseconds of the measurement area 535 is within the sensing slot520-d. Such an adjustment to the measurement area 535 within a sensingslot 520 may be applicable for type2A and type2B channel sensingprocedures.

As shown in the communications timeline 503, an IAB node 530-e may bescheduled to transmit an MT transmission 505-e and a DU transmission510-e and may use a baseline timing option. As such, the MT transmission505-e may be offset in time from the DU transmission 510-e. For example,the MT transmission 505-e may precede the DU transmission 510-e by atime gap T3. In some examples, the MT transmission 505-e may beassociated with a sensing slot 515-e during which the IAB node 530-e mayperform a first channel sensing procedure and the DU transmission 510-emay be associated with a sensing slot 520-e during which the IAB node530-e may perform a second channel sensing procedure. The sensing slot515-e and the sensing slot 520-e may be examples of a last sensing slot(for example, the sensing slot latest in time or the sensing slotaligned with the beginning of a COT) of a type2B channel sensingprocedure, as described in more detail with reference to FIG. 4 . Thesensing slot 515-e and the sensing slot 520-e may each includemeasurement areas 535 during which the IAB node 530-d may measure anenergy of the channel.

In similarity to communications timeline 503, the communicationstimeline 504 also illustrates implementations in which the IAB node530-e may adjust the timing of the measurement area 535 within a sensingslot in addition, or as an alternative, to adjusting the timing of thesensing slot. For example, the IAB node 530-e may modify the measurementarea 535 within the sensing slot 520-e such that the IAB node 530-e mayperform the second channel sensing procedure during the measurement area535 of the sensing slot 520-e without interference from the MTtransmission 505-e and without changing the alignment of the sensingslot 520-d with the DU transmission 510-e. In some examples, the IABnode 530-e may adjust the measurement area 535 within the sensing slot520-e such that less than 4 microseconds of the measurement area 535 iswithin the sensing slot 520-e. In such examples, the sensing slot 515-emay include a first portion of the measurement area 535 that spans atime duration greater than or equal to 4 microseconds and the sensingslot 520-e may include a second portion of the measurement area 535 in asensing window that is less than 4 microseconds. In someimplementations, the IAB node 530-e may adjust the measurement area 535within the sensing slot 520-e to be less than 4 microseconds if T3 isless than a threshold time duration or if the DU transmission 510-espans less than a threshold time duration (for example, less than 584microseconds). Such an adjustment to the measurement area 535 within asensing slot may be applicable for type2B channel sensing procedures.

Upon performing the first channel sensing procedure and the secondchannel sensing procedure, the IAB node 530 may select or determinewhether to transmit the MT transmission 505 or the DU transmission 510,or both, in accordance with a success of the first channel sensingprocedure or the second channel sensing procedure, or both, and theduplexing capability of the IAB node 530. For example, in examples inwhich the first channel sensing procedure and the second channel sensingprocedure are both successful, but the IAB node 530 is incapable oftransmitting via multiple wireless roles simultaneously, the IAB node530 may select one of the MT transmission 505 or the DU transmission 510to transmit during an initiated COT and either transmit the remainingtransmission after transmitting the selected transmission (within thesame COT) or determine to initiate a new COT for the remainingtransmission.

The first channel sensing procedure for the MT transmission 505 and thesecond channel sensing procedure for the DU transmission 510 may beimplemented independently or in conjunction with each other. Forexample, in some implementations, the IAB node 530 may perform the firstchannel sensing procedure independently from the second channel sensingprocedure and, as such, the IAB node may initiate a first COT for the MTtransmission 505 and a second COT for the DU transmission 510. Suchindependent channel sensing procedures may be performed at differentantenna panels of the IAB node 530 that are sufficiently isolated fromeach another. In some other implementations, the IAB node 530 mayperform the first channel sensing procedure in conjunction with thesecond channel sensing procedure.

For example, the IAB node 530 may measure an ED value at a first antennapanel during a first channel sensing procedure, initiate a COT for an MTtransmission 505 as a result of measuring or determining that the EDvalue satisfies a first ED threshold of the first channel sensingprocedure, and share the initiated COT with a DU transmission 510 as aresult of measuring or determining that the measured ED value alsosatisfies a second ED threshold of the second channel sensing procedure.The IAB node 530 may perform a similar process for performing the secondchannel sensing procedure at a second antenna panel, initiating a COTfor a DU transmission 510 as a result of measuring or determining that ameasured ED value satisfies the second ED threshold, and share theinitiated COT with an MT transmission 505 as a result of measuring ordetermining that the measured ED value also satisfies the first EDthreshold. In some examples, the ED threshold that the IAB node 530 mayuse to configure or determine whether a first wireless node is able toshare a COT that was initiated for a second wireless node may be morestrict (for example, a lower threshold value) than the ED threshold thatthe IAB node 530 may use if the channel sensing procedure was performedat the antenna panel used by the first wireless node.

Further, although the first channel sensing procedure is described asbeing for the MT transmission 505 and the second channel sensingprocedure is described as being for the DU transmission 510, the firstchannel sensing procedure may additionally, or alternatively, be achannel sensing procedure that uses a first one or more receive beams(or sensing beams) that correspond to a first set of transmit beams thatthe IAB node 530 uses to transmit via the MT role of the IAB node 530.Similarly, the second channel sensing procedure may additionally, oralternatively, be a channel sensing procedure that uses a second one ormore receive beams (or sensing beams) that correspond to a second set oftransmit beams that the IAB node 530 uses to transmit via the DU role ofthe IAB node 530. As such, the separate channel sensing procedures maybe viewed as either beam-specific or role-specific, or both, dependingon the implementation.

Additionally, although illustrated in the communications timelines 500,501, 502, 503, and 504 as using a baseline timing option, the describedtechniques are equally applicable to examples in which an alignedtransmission timing option is used. For example, the IAB networkincluding the IAB node 530 may support half-duplex (for example, SDMsimultaneous transmission or SDM simultaneous reception) or full-duplex(for example, simultaneous transmission and reception) capabilities,which may support aligned transmissions or receptions, or both, via theMT role and the DU role of the IAB node 530. For instance, in examplesin which the IAB node 530 uses aligned timing, an MT transmission 505may be aligned in time with a DU transmission 510. In such examples, theIAB node 530 may select, configure, or otherwise determine a timing forthe sensing slot 515 for performing the first channel sensing procedureand a timing for the sensing slot 520 for performing the second channelsensing procedure using the aligned transmission timing.

In some other examples, the IAB node 530 may align (for example,artificially align) an MT transmission 505 and a DU transmission 510 byadding a filler signal, such as an extended cyclic prefix (CP), toeither the MT transmission 505 or the DU transmission 510 in accordancewith which of the MT transmission 505 and the DU transmission 510 isscheduled for later transmission. In such examples, the IAB node 530 mayselect, configure, or otherwise determine a timing for a sensing slot515 for performing the first channel sensing procedure and a timing fora sensing slot 520 for performing the second channel sensing procedureusing the artificially aligned timing of the MT transmission 505 and theDU transmission 510. Additional details relating to the addition of afiller signal to one of the MT transmission 505 and the DU transmission510 are described herein, for example, with reference to FIG. 6 .

FIG. 6 illustrates an example alignment procedure 600 that supportschannel sensing procedures for communications at an IAB node. In someexamples, the alignment procedure 600 may be implemented to realizeaspects of the wireless communications system 100 or the IAB network200. In some implementations, an IAB node 625, which may be an exampleof corresponding devices as described with reference to FIGS. 1-5 , mayuse the alignment procedure 600 to artificially align an MT transmission605 with a DU transmission 610 and may select, configure, or otherwisedetermine a timing for performing a first channel sensing procedure forthe MT transmission 605 and a second channel sensing procedure for theDU transmission 610 in accordance with the artificially alignedtransmission timing.

For example, the IAB node 625 may be scheduled to simultaneouslytransmit an MT transmission 605 and a DU transmission 610 and may use abaseline timing option. As such, the MT transmission 605 may be offsetin time from the DU transmission 610. For example, the MT transmission605 may precede the DU transmission 610 by a time gap T3, which may bedetermined using the TA of the IAB node 625 and a T_delta parameter. Forinstance, T3 may be defined as T3=TA/2+T_delta.

In some implementations, the IAB node 625 may completely or partiallyalign the DU transmission 610 with the MT transmission 605 as a resultof using a filler signal 615. For example, the IAB node 625 may add orotherwise apply the filler signal 615 to the DU transmission 610 toartificially align (in full or in part) the DU transmission 610 with theMT transmission 605. The filler signal 615 may be an example of anysignaling, and in some examples the IAB node 625 may add the fillersignal 615 to the DU transmission 610 by using an extended CP in a firstOFDM symbol 620 during which the DU transmission 610 is transmitted. Aprocess 630 illustrates an example process that the IAB node 625 mayperform to increase (or extend) an initial CP 635 of the DU transmission610 to an extended CP 640 that is added to the DU transmission 610. Asillustrated in process 630, the addition or use of the extended CP 640may increase the length of the DU transmission 610 such that the longerlength DU transmission 610 may align with the MT transmission 605. Insome examples, the OFDM symbol 620 may be the first symbol of the COTincluding the DU transmission 610.

In some examples, the IAB node 625 may report a capability of the IABnode to support the addition of a filler signal 615 (such as an extendedCP 640) to DU transmissions 610. In some implementations, the IAB node625 may signal a message to a parent IAB node or an IAB donor node (forexample, a CU of an IAB donor node) including an indication of thecapability of the IAB node 625 to support the addition of a fillersignal 615. The IAB node 625 may transmit the message as an F1-APmessage, an RRC message, or a MAC-CE. Additionally, or alternatively,the IAB node 625 may receive a message configuring the IAB node 625 toadd a filler signal 615 to a first symbol of a DU transmission 610 froma parent IAB node or an IAB donor node (for example, a CU of an IABdonor node). The parent IAB node may transmit the message to the IABnode 625 as a MAC-CE or in DCI and the IAB donor node may transmit themessage to the IAB node 625 as an F1-AP message or an RRC message.

Although the alignment procedure 600 is described in the context ofadding a filler signal 615 to a DU transmission 610, the describedtechniques may be equally applicable in the context of adding a fillersignal 615 to an MT transmission 605. For instance, in examples in whichthe DU transmission 610 is scheduled for transmission earlier than theMT transmission 605, the IAB node 625 may add a filler signal 615 to thefirst symbol of the MT transmission 605 to artificially align (in fullor in part) the MT transmission 605 with the DU transmission 610.

Upon complete or partial alignment of the MT transmission 605 and the DUtransmission 610, the IAB node 625 may select or determine a timing of afirst sensing slot for performing the first channel sensing procedureand a timing of a second sensing slot for performing the second channelsensing procedure in accordance with the aligned (the artificiallyaligned) transmission timing of the MT transmission 605 and the DUtransmission 610. In some examples in which the IAB node 625 adds afiller signal 615 to align the MT transmission 605 and the DUtransmission 610, the IAB node 625 may align the first sensing slot forperforming the first channel sensing procedure with the transmissiontiming of the MT transmission 605 and determine to align the secondsensing slot for performing the second channel sensing procedure withthe timing of the filler signal 615. As such, the IAB node 625 mayperform the separate channel sensing procedures and, in examples inwhich the measured energies satisfy the ED thresholds, the IAB node 625may initiate a COT for transmitting the MT transmission 605 and the DUtransmission 610.

FIG. 7 illustrates an example process flow 700 that supports channelsensing procedures for communications at an IAB node. In some examples,the process flow 700 may implement aspects of the wirelesscommunications system 100 or the IAB network 200. The process flow 700may illustrate communication between an IAB node 705, a parent node 710(which may be an example of a parent IAB node or an IAB donor node), anda child node 715 (which may be an example of a child IAB node or a UE115). The IAB node 705, the parent node 710, and the child node 715 maybe examples of corresponding devices described with reference to FIGS.1-6 . In some examples, the IAB node 705 may perform separate channelsensing procedures for transmitting via an MT role and the DU role ofthe IAB node 705. Alternative examples of the following may beimplemented, where some processes are performed in a different orderthan described or are not performed at all. In some implementations,processes may include additional features not mentioned below, orfurther processes may be added.

At 720, the IAB node 705 may establish a first wireless role and asecond wireless role for the IAB node 705. The first wireless role ofthe IAB node 705 may be an MT role of the IAB node 705 and the secondwireless role of the IAB node 705 be a DU role of the IAB node 705. Insome examples, the IAB node 705 may use the first wireless role (the MTrole) for upstream communications over a wireless backhaul link betweenthe IAB node 705 and the parent node 710 and the IAB node 705 may usethe second wireless role (the DU role) for downstream communicationsover an access link or a wireless backhaul link between the IAB node 705and the child node 715. As described herein, the MT role and the DU rolemay be separate entities (for example, use different antenna panels) ormay be the same entity (for example, share an antenna panel).

At 725, the IAB node 705 may transmit capability signaling to the parentnode 710. In some examples, the capability signaling may include asensing capability, a duplexing capability, a capability for adding afiller signal to transmissions via the MT role or the DU role of the IABnode 705, a capability of adding a gap or an offset between a sensingslot and a transmission, or any combination thereof. In examples inwhich the capability signaling includes a sensing capability, thecapability signaling may include an indication that the IAB node 705 mayperform separate channel sensing procedures for transmissions via the MTrole and the DU role of the IAB node 705, an indication that the IABnode 705 may perform the common channel sensing procedure as multiplenodes (for example, using different antenna panels), an indication ofwhether the IAB node 705 may perform the common channel sensingprocedure at one entity while transmitting from a different entity, anindication of whether the IAB node 705 may perform multiple channelsensing procedures at the same time, or any combination thereof. Inexamples in which the capability signaling includes a duplexingcapability, the capability signaling may include an indication ofwhether the IAB node 705 has a TDM capability, an SDM simultaneousreception capability, an SDM simultaneous transmission capability, or afull-duplex capability. The IAB node 705 may transmit the sensingcapability to the parent node 710 (at least one of a parent IAB node ora central unit of an IAB donor node) as one or more of an F1-AP message,an RRC message, or a MAC-CE.

At 730, the parent node 710 may transmit configuration signaling to theIAB node 705. For example, the IAB node 705 may receive a configurationfor performing the first channel sensing procedure and the secondchannel sensing procedure at the IAB node 705. In some examples, theconfiguration for performing the channel sensing procedure may includean indication that the IAB node 705 is to perform separate channelsensing procedures for transmissions via the MT role and the DU role ofthe IAB node 705, an indication of which types (for example, type1,type2A, or type2B) of channel sensing procedures the IAB node 705 mayperform, an indication of a timing of the separate channel sensingprocedures (such as a shifting gap between a sensing slot and atransmission), an indication of one or more thresholds that the IAB node705 may use to determine a timing of the separate channel sensingprocedures, or any combination thereof. The IAB node 705 may receive theconfiguration as one or more of an F1-AP message or an RRC message (inexamples in which the configuration is transmitted or output fortransmission via a CU of an IAB donor node) or as one or more of aMAC-CE or in DCI (in examples in which the configuration is transmittedvia a parent IAB node).

At 735, the IAB node 705 may select, configure, or otherwise determine afirst sensing slot for performing the first channel sensing procedureand a second sensing slot for performing the second channel sensingprocedure. In some examples, the first sensing slot is aligned with afirst transmission timing of a first transmission and the second sensingslot is aligned with a second transmission timing of a secondtransmission (for example, as described with reference to communicationstimeline 500). In some other examples, the first sensing slot is alignedwith the first transmission timing of the first transmission and thesecond sensing slot is offset (for example, by a time gap) from thesecond transmission timing of the second transmission in correlationwith the transmission timing of the first transmission (for example, asdescribed with reference to communications timeline 501). In some otherexamples, the first sensing slot is aligned with the first transmissiontiming of the first transmission and the IAB node 705 refrains fromperforming the second channel sensing procedure (for example, asdescribed with reference to communications timeline 502).

In some other examples, the first sensing slot is aligned with the firsttransmission timing of the first transmission and the second sensingslot is aligned with the second transmission timing of the secondtransmission, and the first sensing slot may have a greater measurementarea (a longer time duration of a measurement area) than the secondsensing slot (for example, as described with reference to communicationstimeline 503). In some examples, the measurement area of the secondsensing slot may be shifted farther into a sensing window (for example,farther away in time from the transmissions) of the second channelsensing procedure (for example, as described with reference tocommunications timeline 504).

At 740, the IAB node 705 may perform at least one of the first channelsensing procedure or the second channel sensing procedure at the IABnode 705. In some examples, the first channel sensing procedure is forthe MT role and the second channel sensing procedure is for the DU role.In some implementations, the IAB node 705 may perform the first channelsensing procedure at a first antenna panel associated with the MT roleand the IAB node 705 may perform the second channel sensing procedure ata second antenna panel associated with the DU role. The IAB node 705 maydetermine a success of the first channel sensing procedure as a resultof measuring or determining that a first ED value measured at the firstantenna panel satisfies a first value (for example, a first EDthreshold) associated with the first channel sensing procedure and theIAB node 705 may determine a success of the second channel sensingprocedure as a result of measuring or determining that a second ED valuemeasured at the second antenna panel satisfies a second value (forexample, a second ED threshold) associated with the second channelsensing procedure. In some implementations, the IAB node 705 may performat least one of the first channel sensing procedure or the secondchannel sensing procedure using one or more sensing beams.

At 745, the IAB node 705 may initiate a COT at the IAB node 705 for thefirst wireless role (the MT role) in accordance with the first channelsensing procedure or for the second wireless role (the DU role) inaccordance with the second channel sensing procedure. For example, theIAB node 705 may measure or determine that the channel is idle(available) as a result of performing the separate channel sensingprocedures at 740 and may initiate the COT for transmissions from theIAB node 705 via the MT role or the DU role, or both. The IAB node 705may initiate the COT for transmissions via one of the MT role or the DUrole, may initiate the COT for transmissions via the MT role that may beshared with transmissions via the DU role, may initiate the COT fortransmissions via the DU role that may be shared with transmissions viathe MT role, or may initiate the COT for transmissions via both the MTrole and the DU role (either for simultaneous transmissions via the MTand the DU role or transmissions from one of the MT role or the DU rolefollowed by transmissions from the other).

At 750, the IAB node 705 may, in some implementations, transmit a firsttransmission via the MT role during the COT. In some examples, the IABnode 705 may transmit the first transmission via the MT role to theparent node 710. Additionally, or alternatively, at 755, the IAB node705 may, in some implementations, transmit a second transmission via theDU role during the COT. In some examples, the IAB node 705 may transmitthe second transmission via the DU role to the child node 715.

FIG. 8 illustrates an example process flow 800 that supports channelsensing procedures for communications at an IAB node. In some examples,the process flow 800 may implement aspects of the wirelesscommunications system 100 or the IAB network 200. The process flow 800may illustrate communication between an IAB node 805 and a parent node810, which may be an example of a parent IAB node or an IAB donor node.The IAB node 805 and the parent node 810 (the parent IAB node or the IABdonor node) may be examples of corresponding devices described withreference to FIGS. 1-7 . In some examples, the IAB node 805 may performseparate channel sensing procedures for transmitting via an MT role anda DU role of the IAB node 805. Alternative examples of the following maybe implemented, where some processes are performed in a different orderthan described or are not performed at all. In some implementations,processes may include additional features not mentioned below, orfurther processes may be added.

At 815, the IAB node 805 may, in some implementations, receive anindication of a first value (for example, a first ED threshold value)and a second value (for example, a second ED threshold value) from theparent node 810. In some examples, the IAB node 805 may receive theindication of the first ED threshold and the second ED threshold asabsolute values. For example, the IAB node 805 may receive a number ofbits or a bit stream corresponding to an absolute value for each of thefirst ED threshold and the second ED threshold. In some other examples,the IAB node 805 may receive the indication of the first ED thresholdand the second ED threshold as offset values relative to a default valueand may determine the first ED threshold and the second ED thresholdusing the offset values and the default value. For example, the IAB node805 may receive an indication of a first offset value relative to adefault value, such as a default ED threshold, and may calculate ordetermine the first ED threshold as a result of adding, subtracting, orperforming some other mathematical operation including the first offsetvalue and the default value. The IAB node 805 may similarly calculate ordetermine the second ED threshold. In some other examples, the IAB node805 may receive an indication of the first ED threshold and the secondED threshold as offset values relative to an indicated parameter and maycalculate or determine the first ED threshold and the second EDthreshold using the offset values and the indicated parameter. Forexample, the parent node 810 may indicate a parameter in addition to afirst offset value, and the IAB node 805 may calculate or determine thefirst ED threshold as a result of adding, subtracting, or performingsome other mathematical operation including the first offset value andthe indicated parameter. The IAB node 805 may similarly calculate ordetermine the second ED threshold. In examples in which the IAB node 805receives the indication of the first ED threshold and the second EDthreshold from the parent node 810, the IAB node 805 may receive theindication as one or more of an F1 AP message, an RRC message, a MAC-CE,or in DCI.

At 820, the IAB node 805 may identify a first value (a first EDthreshold) for a first channel sensing procedure associated with a firstwireless role (an MT role) and a second value (a second ED threshold)for a second channel sensing procedure associated with a second wirelessrole (a DU role). In some examples, the IAB node 805 may select,calculate, or determine the first ED threshold and the second EDthreshold in accordance with receiving the indication at 815. In someother examples, the IAB node 805 may determine the first ED thresholdand the second ED threshold in accordance with a condition at the IABnode 805 or the configuration of the separate channel sensingprocedures. For example, the IAB node 805 may determine the first EDthreshold and the second ED threshold in accordance with whether the EDthresholds are for one or more of a threshold for a channel sensingprocedure for an incoming transmission via the MT role, threshold for achannel sensing procedure for an incoming transmission via the DU role,a threshold that is used by the DU role of the IAB node 805 to share aninitiated COT with a co-located MT, a threshold that is used by the MTrole of the IAB node 805 to share an initiated COT with a co-located DU,separate thresholds associated with different sets of sensing beams,separate thresholds associated with different sets of beam pairs (forexample, different unique pairs of a sensing beam and a transmit beam),or separate thresholds that are used for a wireless role in the presenceof a transmission from another wireless role and in the absence of atransmission from another wireless role. In some examples, the first EDthreshold may be different than the second ED threshold because the MTrole and the DU role may have different maximum transmit powers ordifferent beam patterns, or both.

At 825, the IAB node 805 may perform at least one of the first channelsensing procedure or the second channel sensing procedure. In someexamples, the IAB node 805 may perform the first channel sensingprocedure using a first set of sensing beams and may perform the secondchannel sensing procedure using a second set of sensing beams. In suchexamples, the IAB node 805 may use a first ED threshold associated withthe first set of sensing beams and a second ED threshold associated withthe second set of sensing beams. In some other examples, the IAB node805 may perform the first channel sensing procedure using a first beampair and may perform the second channel sensing procedure using a secondbeam pair. In such examples, the IAB node 805 may use a first EDthreshold associated with the first beam pair and may use a second EDthreshold associated with the second beam pair. In some other examples,the IAB node 805 may perform the first channel sensing procedure or thesecond channel sensing procedure, or both, during sensing slots that areabsent of transmissions via other wireless roles of the IAB node 805. Insuch examples, the IAB node 805 may use a first ED threshold or a secondED threshold, or both, associated with the absence of transmissions viaother wireless roles of the IAB node 805. In some other examples, theIAB node 805 may perform the first channel sensing procedure or thesecond channel sensing procedure, or both, during sensing slots in thepresence of transmissions via other wireless roles of the IAB node 805.In such examples, the IAB node 805 may use a first ED threshold or asecond ED threshold, or both, associated with the presence oftransmissions via other wireless roles of the IAB node 805.

At 830, the IAB node measure or otherwise determine whether at least oneED value associated with a channel satisfies at least one of the firstvalue (the first ED threshold) or the second value (the second EDthreshold). In some examples, the IAB node 805 may measure or determinea first ED value as a result of the first channel sensing procedure andmay compare the first ED value to the first ED threshold associated withthe first channel sensing procedure to determine whether the first EDvalue satisfies (is less than or equal to) the first ED threshold.Similarly, the IAB node 805 may measure or determine a second ED valueas a result of the second channel sensing procedure and may compare thesecond ED value to the second ED threshold associated with the secondchannel sensing procedure to determine whether the second ED valuesatisfies (is less than or equal to) the second ED threshold. The IABnode 805 may measure or determine the ED values as a result of measuringa channel during a measurement area of a sensing slot and the measuredED values may be associated or correlated with the set of sensing beamsassociated with the channel sensing procedure, the beam pair associatedwith the channel sensing procedure, the presence of transmissions viaother wireless roles of the IAB node 805 during the channel sensingprocedure, or any combination thereof.

At 835, the IAB node 805 may select, configure, or otherwise determinewhether to initiate a COT for at least one of the first wireless role(the MT role) or the second wireless role (the DU role) based at leastin part on measuring or determining whether the at least one ED valueassociated with the channel satisfies at least one of the first value(the first ED threshold) or the second value (the second ED threshold).In some examples, the IAB node 805 may initiate the COT fortransmissions via the MT role if a first ED value satisfies the first EDthreshold and may initiate the COT for transmissions via the DU role ifthe second ED value satisfies the second ED threshold. The IAB node 805may initiate the COT for transmissions via one of the MT role or the DUrole, may initiate the COT for transmissions via the MT role that may beshared with transmissions via the DU role, may initiate the COT fortransmissions via the DU role that may be shared with transmissions viathe MT role, or may initiate the COT for transmissions via both the MTrole and the DU role (either for simultaneous transmissions via the MTand the DU role or transmissions from one of the MT role or the DU rolefollowed by transmissions from the other).

FIG. 9 shows a block diagram of an example device 905 that supportschannel sensing procedures for communications at an IAB node. The device905 may be an example of or include the components of an IAB node asdescribed herein. In some examples, the device 905 may be an example orinclude the components of a wireless device or a wireless deviceapparatus as described herein. The device 905 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 910, an input/output (I/O) controller 915, a transceiver 920, anantenna 925, memory 930, a processor 940, and a coding manager 950.These components may be in electronic communication via one or morebuses (for example, bus 945).

The I/O controller 915 may manage input and output signals for thedevice 905. The I/O controller 915 also may manage peripherals notintegrated into the device 905. In some examples, the I/O controller 915may represent a physical connection or port to an external peripheral.In some examples, the I/O controller 915 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In some other examples, the I/Ocontroller 915 may represent or interact with a modem, a keyboard, amouse, a touchscreen, or a similar device. In some examples, the I/Ocontroller 915 may be implemented as part of a processor. In someexamples, a user may interact with the device 905 via the I/O controller915 or via hardware components controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described throughout. For example,the transceiver 920 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 920 also may include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some examples, the wireless device may include a single antenna 925.In such examples, the device 905 may use a single antenna 925 tocommunicate via both the first wireless role (for example, an MT role ofthe device 905) and the second wireless role (for example, a DU role ofthe device 905). However, in some examples the device may have more thanone antenna 925, which may be capable of concurrently transmitting orreceiving multiple wireless transmissions. In such examples, the device905 may use a first antenna 925 to communicate via the first wirelessrole (for example, the MT role of the device 905) and may use a secondantenna 925 to communicate via the second wireless role (for example,the DU role of the device 905).

The memory 930 may include random-access memory (RAM) and read-onlymemory (ROM). The memory 930 may store computer-readable,computer-executable code 935 including instructions that, when executed,cause the processor to perform various functions described herein. Insome examples, the memory 930 may contain, among other things, a basicI/O system (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

The processor 940 may be any one or more suitable processors capable ofexecuting scripts or instructions of one or more software programsstored in the device 905 (such as within the memory 930). In someimplementations, the processor 940 may be a component of a processingsystem. A processing system may generally refer to a system or series ofmachines or components that receives inputs and processes the inputs toproduce a set of outputs (which may be passed to other systems orcomponents of, for example, the device 905). For example, a processingsystem of the device 905 may refer to a system including the variousother components or subcomponents of the device 905.

The processing system of the device 905 may interface with othercomponents of the device 905, and may process information received fromother components (such as inputs or signals) or output information toother components. For example, a chip or modem of the device 905 mayinclude a processing system, a first interface to output information,and a second interface to obtain information. In some implementations,the first interface may refer to an interface between the processingsystem of the chip or modem and a transmitter, such that the device 905may transmit information output from the chip or modem. In someimplementations, the second interface may refer to an interface betweenthe processing system of the chip or modem and a receiver, such that thedevice 905 may obtain information or signal inputs, and the informationmay be passed to the processing system. A person having ordinary skillin the art will readily recognize that the first interface also mayobtain information or signal inputs, and the second interface also mayoutput information or signal outputs.

In some examples, the communications manager 910, if functioning as orin conjunction with processor or a processing system, may outputsignaling for transmission during the COT via at least one of the firstwireless role or the second wireless role. For example, thecommunications manager 910 may output signaling to the transceiver 920for transmission during the COT via at least one of the first wirelessrole or the second wireless role. Similarly, the communications manager910 also may obtain signaling (for example, messages, indications, orany other signing that may be transmitted to the device 905) from thetransceiver 920. For example, the communications manager 910 may obtain,from the transceiver 920, a configuration of separate channel sensingprocedures or an indication of ED threshold, or both.

In some examples, the communications manager 910 may be implemented asan integrated circuit or chipset for a device modem, and the receiverand the transmitter may be implemented as analog components (forexample, amplifiers, filters, antennas) coupled with the device modem toenable wireless transmission and reception over one or more bands.

The device 905 may support wireless communications at a wireless deviceapparatus in accordance with examples as disclosed herein. Thecommunications manager 910 may be configured as or otherwise support ameans for establishing a first wireless role and a second wireless rolefor the wireless device apparatus, where the first wireless role isassociated with upstream communications, and the second wireless role isassociated with downstream communications. In some examples, thecommunications manager 910 may be configured as or otherwise support ameans for performing at least one of a first channel sensing procedureor a second channel sensing procedure at the wireless device apparatus,where the first channel sensing procedure is for the first wireless roleand the second channel sensing procedure is for the second wirelessrole. In some examples, the communications manager 910 may be configuredas or otherwise support a means for initiating a COT at the wirelessdevice apparatus for the first wireless role based on the first channelsensing procedure or for the second wireless role based on the secondchannel sensing procedure, or both. In some examples, the communicationsmanager 910 may be configured as or otherwise support a means fortransmitting during the COT via at least one of the first wireless roleor the second wireless role.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure at a first antenna panel associated with thefirst wireless role. In some examples, to support performing at leastone of the first channel sensing procedure or the second channel sensingprocedure at the wireless device apparatus, the communications manager910 may be configured as or otherwise support a means for performing thesecond channel sensing procedure at a second antenna panel associatedwith the second wireless role.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a success of the first channelsensing procedure based on a first ED value associated with the firstantenna panel and a first value associated with the first channelsensing procedure, where the first ED value satisfies the first value.In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a success of the secondchannel sensing procedure based on a second ED value associated with thesecond antenna panel and a second value associated with the secondchannel sensing procedure, where the second ED value satisfies thesecond value.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure and the second channel sensing procedure at anantenna panel of the wireless device apparatus associated with the firstwireless role.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a success of the first channelsensing procedure based on an ED value associated with the antenna paneland a first value associated with the first channel sensing procedure,where the ED value satisfies the first value. In some examples, thecommunications manager 910 may be configured as or otherwise support ameans for determining a success of the second channel sensing procedurebased on the ED value associated with the antenna panel and a secondvalue associated with the second channel sensing procedure, where the EDvalue satisfies the second value.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure and the second channel sensing procedure at anantenna panel of the wireless device apparatus associated with thesecond wireless role.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a success of the first channelsensing procedure based on an ED value associated with the antenna paneland a first value associated with the first channel sensing procedure,where the ED value satisfies the first value. In some examples, thecommunications manager 910 may be configured as or otherwise support ameans for determining a success of the second channel sensing procedurebased on the ED value associated with the antenna panel and a secondvalue associated with the second channel sensing procedure, where the EDvalue satisfies the second value.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for determining one or moresensing beams associated with at least one of the first channel sensingprocedure or the second channel sensing procedure. In some examples, tosupport performing at least one of the first channel sensing procedureor the second channel sensing procedure at the wireless deviceapparatus, the communications manager 910 may be configured as orotherwise support a means for performing at least one of the firstchannel sensing procedure or the second channel sensing procedure usingthe one or more sensing beams.

In some examples, to support transmitting, by the wireless deviceapparatus, via at least one of the first wireless role or the secondwireless role during the COT, the communications manager 910 may beconfigured as or otherwise support a means for transmitting via the oneor more transmit beams.

In some examples, the communications manager 910 may be configured as orotherwise support a means for transmitting, by the wireless deviceapparatus to a parent node or a central unit, a sensing capability,where performing the first channel sensing procedure for the firstwireless role and the second channel sensing procedure for the secondwireless role is based on the sensing capability.

In some examples, the sensing capability includes an indication that thewireless device apparatus performs the first channel sensing procedurefor the first wireless role and the second channel sensing procedure forthe second wireless role as multiple nodes. In some examples, thesensing capability includes an indication of whether the wireless deviceapparatus is capable of performing at least one of the first channelsensing procedure while transmitting via the second wireless role or thesecond channel sensing procedure while transmitting via the firstwireless role. In some examples, the wireless device apparatus maytransmit the sensing capability via an F1-AP message, an RRC message, ora MAC-CE.

In some examples, to support transmitting during the COT via at leastone of the first wireless role or the second wireless role, thecommunications manager 910 may be configured as or otherwise support ameans for determining a duplex capability of the wireless deviceapparatus, a success of the first channel sensing procedure, and asuccess of the second channel sensing procedure. In some examples, tosupport transmitting during the COT via at least one of the firstwireless role or the second wireless role, the communications manager910 may be configured as or otherwise support a means for determiningwhether to transmit at least one of a first transmission from thewireless device apparatus via the first wireless role or a secondtransmission from the wireless device apparatus via the second wirelessrole based on the duplex capability of the wireless device apparatus,the success of the first channel sensing procedure, and the success ofthe second channel sensing procedure.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a first transmission timing ofa first transmission from the wireless device apparatus via the firstwireless role and a second transmission timing of a second transmissionfrom the wireless device apparatus via the second wireless role. In someexamples, the communications manager 910 may be configured as orotherwise support a means for determining a first sensing slot forperforming the first channel sensing procedure and a second sensing slotfor performing the second channel sensing procedure, where the firstsensing slot is aligned with the first transmission timing of the firsttransmission and the second sensing slot is aligned with the secondtransmission timing of the second transmission.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining that the wireless deviceapparatus satisfies an interference metric. In some examples, to supportdetermining that the wireless device apparatus satisfies theinterference metric, the communications manager 910 may be configured asor otherwise support a means for applying a signal processing techniqueto at least one of the first sensing slot or the second sensing slot.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure during a first measurement area within thefirst sensing slot, where the first measurement area has a first timeduration. In some examples, to support performing at least one of thefirst channel sensing procedure or the second channel sensing procedureat the wireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the secondchannel sensing procedure during a second measurement area within thesecond sensing slot, where the second measurement area has a second timeduration less than the first time duration.

In some examples, the first time duration is equal to four microsecondsand the second time duration is less than four microseconds. In someexamples, the first measurement area and the second measurement area arealigned in time.

In some examples, to support performing at least one of the firstchannel sensing procedure or the second channel sensing procedure at thewireless device apparatus, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure during a first measurement area of a firstsensing window, where the first sensing window includes the firstsensing slot, and where the first sensing slot includes a first portionof the first measurement area. In some examples, to support performingat least one of the first channel sensing procedure or the secondchannel sensing procedure at the wireless device apparatus, thecommunications manager 910 may be configured as or otherwise support ameans for performing the second channel sensing procedure during asecond measurement area of a second sensing window, where the secondsensing window includes the second sensing slot, and where the secondsensing slot includes a second portion of the second measurement area,the second portion of the second measurement area including a smallertime duration than the first portion of the first measurement area.

In some examples, the first portion of the first measurement areaincludes at least four microseconds and the second portion of the secondmeasurement area includes less than four microseconds. In some examples,the first sensing slot at least partially overlaps with the secondsensing slot.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a first transmission timing ofa first transmission from the wireless device apparatus via the firstwireless role and a second transmission timing of a second transmissionfrom the wireless device apparatus via the second wireless role. In someexamples, the communications manager 910 may be configured as orotherwise support a means for determining a first sensing slot forperforming the first channel sensing procedure and a second sensing slotfor performing the second channel sensing procedure, where the firstsensing slot is aligned with the first transmission timing of the firsttransmission and the second sensing slot is offset from the secondtransmission timing of the second transmission based on the firsttransmission timing of the first transmission.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining that the wireless deviceapparatus fails to satisfy an interference metric, where the secondsensing slot being offset from the second transmission timing of thesecond transmission based on the first transmission timing of the firsttransmission is based on determining that the wireless device apparatusfails to satisfy the interference metric.

In some examples, the first transmission timing of the firsttransmission is within a threshold time duration of the secondtransmission timing of the second transmission. In some examples, thefirst sensing slot and the second sensing slot avoid overlapping witheither of the first transmission or the second transmission.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a first transmission timing ofa first transmission from the wireless device apparatus via the firstwireless role and a second transmission timing of a second transmissionfrom the wireless device apparatus via the second wireless role. In someexamples, the communications manager 910 may be configured as orotherwise support a means for determining a first sensing slot forperforming the first channel sensing procedure. In some examples, thecommunications manager 910 may be configured as or otherwise support ameans for refraining from performing the second channel sensingprocedure.

In some examples, the first transmission timing of the firsttransmission is within a threshold time duration of the secondtransmission timing of the second transmission. In some examples, thesecond transmission is less than a threshold time duration.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining a first transmission timing ofa first transmission from the wireless device apparatus via the firstwireless role and a second transmission timing of a second transmissionfrom the wireless device apparatus via the second wireless role. In someexamples, the communications manager 910 may be configured as orotherwise support a means for adding a filler signal to a beginning ofthe second transmission, where the first transmission timing precedesthe second transmission timing by a time duration equal to a duration ofthe filler signal. In some examples, the communications manager 910 maybe configured as or otherwise support a means for determining a firstsensing slot for performing the first channel sensing procedure and asecond sensing slot for performing the second channel sensing procedure,where the first sensing slot is aligned with the first transmissiontiming of the first transmission and the second sensing slot is alignedwith the filler signal.

In some examples, the communications manager 910 may be configured as orotherwise support a means for receiving a configuration for performingthe first channel sensing procedure and the second channel sensingprocedure at the wireless device apparatus.

In some examples, the wireless device apparatus may receive theconfiguration via an F1-AP message, an RRC message, a MAC-CE, or DCI. Insome examples, the wireless device apparatus is an IAB node and, in someexamples, the first wireless role includes an MT role and the secondwireless role includes a DU role.

Additionally, or alternatively, the device 905 may support wirelesscommunications at a wireless device apparatus in accordance withexamples as disclosed herein. In some examples, the communicationsmanager 910 may be configured as or otherwise support a means foridentifying a first value for a first channel sensing procedureassociated with a first wireless role of the wireless device apparatusand a second value for a second channel sensing procedure associatedwith a second wireless role of the wireless device apparatus. In someexamples, the communications manager 910 may be configured as orotherwise support a means for determining whether at least one ED valueassociated with a channel satisfies at least one of the first value orthe second value. In some examples, the communications manager 910 maybe configured as or otherwise support a means for determining whether toinitiate a COT for at least one of the first wireless role or the secondwireless role based on determining whether the at least one ED valueassociated with the channel satisfies at least one of the first value orthe second value.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining an ED valuebased on the first channel sensing procedure. In some examples, tosupport determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining whether the ED value satisfies the firstvalue, where determining whether to initiate the COT for the firstwireless role is based on determining whether the ED value satisfies thefirst value.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining an ED valuebased on the second channel sensing procedure. In some examples, tosupport determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining whether the ED value satisfies thesecond value, where determining whether to initiate the COT for thesecond wireless role is based on determining whether the ED valuesatisfies the second value.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining an ED value based on the firstchannel sensing procedure. In some examples, the communications manager910 may be configured as or otherwise support a means for determiningthat the ED value satisfies the first value. In some examples, thecommunications manager 910 may be configured as or otherwise support ameans for initiating the COT for the first wireless role based ondetermining that the ED value satisfies the first value. In someexamples, the communications manager 910 may be configured as orotherwise support a means for determining that the ED value satisfiesthe second value. In some examples, the communications manager 910 maybe configured as or otherwise support a means for including, within theCOT initiated for the first wireless role, one or more transmissionsfrom the wireless device apparatus via the second wireless role based ondetermining that the ED value satisfies the second value.

In some examples, the communications manager 910 may be configured as orotherwise support a means for determining an ED value based on thesecond channel sensing procedure. In some examples, the communicationsmanager 910 may be configured as or otherwise support a means fordetermining that the ED value satisfies the second value. In someexamples, the communications manager 910 may be configured as orotherwise support a means for initiating the COT for the second wirelessrole based on determining that the ED value satisfies the second value.In some examples, the communications manager 910 may be configured as orotherwise support a means for determining that the ED value satisfiesthe first value. In some examples, the communications manager 910 may beconfigured as or otherwise support a means for including, within the COTinitiated for the second wireless role, one or more transmissions fromthe wireless device apparatus via the first wireless role based ondetermining that the ED value satisfies the first value.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure using a set of sensing beams. In someexamples, to support determining whether the at least one ED valueassociated with the channel satisfies at least one of the first value orthe second value, the communications manager 910 may be configured as orotherwise support a means for determining an ED value based onperforming the first channel sensing procedure using the set of sensingbeams. In some examples, to support determining whether the at least oneED value associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining whether theED value satisfies the first value, where the first value is for thefirst channel sensing procedure using the set of sensing beams.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing the secondchannel sensing procedure using a set of sensing beams. In someexamples, to support determining whether the at least one ED valueassociated with the channel satisfies at least one of the first value orthe second value, the communications manager 910 may be configured as orotherwise support a means for determining an ED value based onperforming the second channel sensing procedure using the set of sensingbeams. In some examples, to support determining whether the at least oneED value associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining whether theED value satisfies the second value, where the second value is for thesecond channel sensing procedure using the set of sensing beams.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing the firstchannel sensing procedure using a beam pair. In some examples, tosupport determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining an ED value based on performing thefirst channel sensing procedure using the beam pair. In some examples,to support determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining whether the ED value satisfies the firstvalue, where the first value is for the first channel sensing procedureusing the beam pair.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing the secondchannel sensing procedure using a beam pair. In some examples, tosupport determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining an ED value based on performing thesecond channel sensing procedure using the beam pair. In some examples,to support determining whether the at least one ED value associated withthe channel satisfies at least one of the first value or the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining whether the ED value satisfies thesecond value, where the second value is for the second channel sensingprocedure using the beam pair.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing at least oneof the first channel sensing procedure or the second channel sensingprocedure during a sensing slot absent of transmissions from thewireless device apparatus. In some examples, to support determiningwhether the at least one ED value associated with the channel satisfiesat least one of the first value or the second value, the communicationsmanager 910 may be configured as or otherwise support a means fordetermining the at least one ED value based on performing at least oneof the first channel sensing procedure or the second channel sensingprocedure during the sensing slot absent of transmissions from thewireless device apparatus.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining whether theat least one ED value satisfies at least one of the first value or thesecond value, where the first value is for the first channel sensingprocedure during the sensing slot absent of transmissions from thewireless device apparatus and the second value is for the second channelsensing procedure during the sensing slot absent of transmissions fromthe wireless device apparatus.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for performing at least oneof the first channel sensing procedure during a first sensing slotincluding transmissions via the second wireless role of the wirelessdevice apparatus or the second channel sensing procedure during a secondsensing slot including transmissions via the first wireless role of thewireless device apparatus. In some examples, to support determiningwhether the at least one ED value associated with the channel satisfiesat least one of the first value or the second value, the communicationsmanager 910 may be configured as or otherwise support a means fordetermining the at least one ED value based on performing at least oneof the first channel sensing procedure during the first sensing slotincluding transmissions via the second wireless role of the wirelessdevice apparatus or the second channel sensing procedure during thesecond sensing slot including transmissions via the first wireless roleof the wireless device apparatus.

In some examples, to support determining whether the at least one EDvalue associated with the channel satisfies at least one of the firstvalue or the second value, the communications manager 910 may beconfigured as or otherwise support a means for determining whether theat least one ED value satisfies at least one of the first value or thesecond value, where the first value is for the first channel sensingprocedure during the first sensing slot including transmissions via thesecond wireless role of the wireless device apparatus and the secondvalue is for the second channel sensing procedure during the secondsensing slot including transmissions via the first wireless role of thewireless device apparatus.

In some examples, the communications manager 910 may be configured as orotherwise support a means for identifying the first value based on afirst class of the first wireless role and the second value based on asecond class of the second wireless role.

In some examples, the first class of the first wireless role includes atleast one of a wide-area class or a local-area class. In some examples,to support identifying the first value and the second value, thecommunications manager 910 may be configured as or otherwise support ameans for receiving an indication of the first value and the secondvalue as one or more of: an F1-AP message, an RRC message, a MAC-CE, orDCI. In some examples, to support identifying the first value and thesecond value, the communications manager 910 may be configured as orotherwise support a means for receiving an indication of the first valueand the second value as absolute values.

In some examples, to support identifying the first value and the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for receiving an indication of at least one of the firstvalue or the second value as offset values relative to a default value.In some examples, to support identifying the first value and the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for determining at least one of the first value or thesecond value based on the offset values and the default value.

In some examples, to support identifying the first value and the secondvalue, the communications manager 910 may be configured as or otherwisesupport a means for receiving an indication of at least one of the firstvalue or the second value as offset values relative to an indicatedparameter. In some examples, to support identifying the first value andthe second value, the communications manager 910 may be configured as orotherwise support a means for determining at least one of the firstvalue or the second value based on the offset values and the indicatedparameter.

In some examples, the wireless device apparatus is an IAB node and, insome examples, the first wireless role includes an MT role and thesecond wireless role includes a DU role.

In some implementations, the communications manager 910 may beconfigured to perform various operations (for example, receiving,monitoring, transmitting) using or otherwise in cooperation with thetransceiver 920, the one or more antennas 925, or any combinationthereof. Although the communications manager 910 is illustrated as aseparate component, in some implementations, one or more functionsdescribed with reference to the communications manager 910 may besupported by or performed by the processor 940, the memory 930, the code935, or any combination thereof. For example, the code 935 may includeinstructions executable by the processor 940 to cause the device 905 toperform various aspects of channel sensing procedures for communicationsat an IAB node as described herein, or the processor 940 and the memory930 may be otherwise configured to perform or support such operations.

The communications manager 910 as described herein may be implemented torealize one or more potential advantages. In some implementations, thecommunications manager 910 may perform separate channel sensingprocedures for transmissions from the device 905 via an MT role and a DUrole of the device 905. In some examples, the device 905, as a result ofperforming separate channel sensing procedures for transmissions via theMT role and the DU role, may reliably and accurately obtain channelaccess in examples in which the MT role and the DU role use separateantenna panels of the device 905 or otherwise have different radiofrequency footprints. As a result of performing reliable channel sensingprocedures, the transmissions from the device 905 via the MT role andthe DU role may have a lower likelihood of being adversely influenced byinterference, which may result in a greater likelihood for a receivingdevice to successfully receive the transmissions from the device 905.

As such, the device 905 may potentially perform fewer retransmissions,which may result in greater spectral efficiency, less overhead, and highdata rates to and from the device 905. Moreover, as a result ofachieving higher data rates and potentially performing fewerretransmissions, the device 905 may spend less time transmitting and,accordingly, the device 905 to enter a sleep mode more frequently or forlonger durations, which may improve power savings at the device 905 andincrease battery life.

FIG. 10 shows a flowchart illustrating an example method 1000 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1000 may be implemented by a device or itscomponents as described herein. For example, the operations of method1000 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1005, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1005 may be performed according to the methods describedherein.

At 1010, the device may perform at least one of a first channel sensingprocedure or a second channel sensing procedure at the wireless deviceapparatus, where the first channel sensing procedure is for the firstwireless role and the second channel sensing procedure is for the secondwireless role. The operations of 1010 may be performed according to themethods described herein.

At 1015, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1015 may beperformed according to the methods described herein.

At 1020, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1020may be performed according to the methods described herein.

FIG. 11 shows a flowchart illustrating an example method 1100 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1100 may be implemented by a device or itscomponents as described herein. For example, the operations of method1100 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1105, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1105 may be performed according to the methods describedherein.

At 1110, the device may transmit, by the wireless device apparatus to aparent node or a central unit, a sensing capability. The operations of1110 may be performed according to the methods described herein.

At 1115, the device may perform at least one of a first channel sensingprocedure or a second channel sensing procedure at the wireless deviceapparatus, where the first channel sensing procedure is for the firstwireless role and the second channel sensing procedure is for the secondwireless role. In some examples, performing the first channel sensingprocedure for the first wireless role and the second channel sensingprocedure for the second wireless role is based on the sensingcapability. The operations of 1115 may be performed according to themethods described herein.

At 1120, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1120 may beperformed according to the methods described herein.

At 1125, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1125may be performed according to the methods described herein.

FIG. 12 shows a flowchart illustrating an example method 1200 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1200 may be implemented by a device or itscomponents as described herein. For example, the operations of method1200 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1205, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1205 may be performed according to the methods describedherein.

At 1210, the device may determine a first transmission timing of a firsttransmission from the wireless device apparatus via the first wirelessrole and a second transmission timing of a second transmission from thewireless device apparatus via the second wireless role. The operationsof 1210 may be performed according to the methods described herein.

At 1215, the device may determine a first sensing slot for performing afirst channel sensing procedure and a second sensing slot for performinga second channel sensing procedure, where the first sensing slot isaligned with the first transmission timing of the first transmission andthe second sensing slot is aligned with the second transmission timingof the second transmission. The operations of 1215 may be performedaccording to the methods described herein.

At 1220, the device may perform at least one of the first channelsensing procedure or the second channel sensing procedure at thewireless device apparatus, where the first channel sensing procedure isfor the first wireless role and the second channel sensing procedure isfor the second wireless role. The operations of 1220 may be performedaccording to the methods described herein.

At 1225, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1225 may beperformed according to the methods described herein.

At 1230, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1230may be performed according to the methods described herein.

FIG. 13 shows a flowchart illustrating an example method 1300 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1300 may be implemented by a device or itscomponents as described herein. For example, the operations of method1300 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1305, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1305 may be performed according to the methods describedherein.

At 1310, the device may determine a first transmission timing of a firsttransmission from the wireless device apparatus via the first wirelessrole and a second transmission timing of a second transmission from thewireless device apparatus via the second wireless role. The operationsof 1310 may be performed according to the methods described herein.

At 1315, the device may determine a first sensing slot for performing afirst channel sensing procedure and a second sensing slot for performinga second channel sensing procedure, where the first sensing slot isaligned with the first transmission timing of the first transmission andthe second sensing slot is offset from the second transmission timing ofthe second transmission based on the first transmission timing of thefirst transmission. The operations of 1315 may be performed according tothe methods described herein.

At 1320, the device may perform at least one of the first channelsensing procedure or the second channel sensing procedure at thewireless device apparatus, where the first channel sensing procedure isfor the first wireless role and the second channel sensing procedure isfor the second wireless role. The operations of 1320 may be performedaccording to the methods described herein.

At 1325, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1325 may beperformed according to the methods described herein.

At 1330, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1330may be performed according to the methods described herein.

FIG. 14 shows a flowchart illustrating an example method 1400 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1400 may be implemented by a device or itscomponents as described herein. For example, the operations of method1400 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1405, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1405 may be performed according to the methods describedherein.

At 1410, the device may determine a first transmission timing of a firsttransmission from the wireless device apparatus via the first wirelessrole and a second transmission timing of a second transmission from thewireless device apparatus via the second wireless role. The operationsof 1410 may be performed according to the methods described herein.

At 1415, the device may determine a first sensing slot for performing afirst channel sensing procedure. The operations of 1415 may be performedaccording to the methods described herein.

At 1420, the device may perform at least one of the first channelsensing procedure or a second channel sensing procedure at the wirelessdevice apparatus, where the first channel sensing procedure is for thefirst wireless role and the second channel sensing procedure is for thesecond wireless role. The operations of 1420 may be performed accordingto the methods described herein.

At 1425, the device may refrain from performing the second channelsensing procedure. The operations of 1425 may be performed according tothe methods described herein.

At 1430, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1430 may beperformed according to the methods described herein.

At 1435, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1435may be performed according to the methods described herein.

FIG. 15 shows a flowchart illustrating an example method 1500 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1500 may be implemented by a device or itscomponents as described herein. For example, the operations of method1500 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1505, the device may establish a first wireless role and a secondwireless role for the wireless device apparatus, where the firstwireless role is associated with upstream communications, and the secondwireless role is associated with downstream communications. Theoperations of 1505 may be performed according to the methods describedherein.

At 1510, the device may determine a first transmission timing of a firsttransmission from the wireless device apparatus via the first wirelessrole and a second transmission timing of a second transmission from thewireless device apparatus via the second wireless role. The operationsof 1510 may be performed according to the methods described herein.

At 1515, the device may add a filler signal to a beginning of the secondtransmission, where the first transmission timing precedes the secondtransmission timing by a time duration equal to a duration of the fillersignal. The operations of 1515 may be performed according to the methodsdescribed herein.

At 1520, the device may determine a first sensing slot for performing afirst channel sensing procedure and a second sensing slot for performinga second channel sensing procedure, where the first sensing slot isaligned with the first transmission timing of the first transmission andthe second sensing slot is aligned with the filler signal. Theoperations of 1520 may be performed according to the methods describedherein.

At 1525, the device may perform at least one of the first channelsensing procedure or the second channel sensing procedure at thewireless device apparatus, where the first channel sensing procedure isfor the first wireless role and the second channel sensing procedure isfor the second wireless role. The operations of 1525 may be performedaccording to the methods described herein.

At 1530, the device may initiate a COT at the wireless device apparatusfor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both. The operations of 1530 may beperformed according to the methods described herein.

At 1535, the device may transmit during the COT via at least one of thefirst wireless role or the second wireless role. The operations of 1535may be performed according to the methods described herein.

FIG. 16 shows a flowchart illustrating an example method 1600 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1600 may be implemented by a device or itscomponents as described herein. For example, the operations of method1600 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1605, the device may identify a first value for a first channelsensing procedure associated with a first wireless role of the wirelessdevice apparatus and a second value for a second channel sensingprocedure associated with a second wireless role of the wireless deviceapparatus. The operations of 1605 may be performed according to themethods described herein.

At 1610, the device may determine whether at least one ED valueassociated with a channel satisfies at least one of the first value orthe second value. The operations of 1610 may be performed according tothe methods described herein.

At 1615, the device may determine whether to initiate a COT for at leastone of the first wireless role or the second wireless role in accordancewith determining whether the at least one ED value associated with thechannel satisfies at least one of the first value or the second value.The operations of 1615 may be performed according to the methodsdescribed herein.

FIG. 17 shows a flowchart illustrating an example method 1700 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1700 may be implemented by a device or itscomponents as described herein. For example, the operations of method1700 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1705, the device may identify a first value for a first channelsensing procedure associated with a first wireless role of the wirelessdevice apparatus and a second value for a second channel sensingprocedure associated with a second wireless role of the wireless deviceapparatus. The operations of 1705 may be performed according to themethods described herein.

At 1710, the device may determine an ED value based on the first channelsensing procedure. The operations of 1710 may be performed according tothe methods described herein.

At 1715, the device may determine whether the ED value satisfies thefirst value. The operations of 1715 may be performed according to themethods described herein.

At 1720, the device may determine whether to initiate a COT for at leastone of the first wireless role or the second wireless role in accordancewith determining whether at least one ED value associated with thechannel satisfies at least one of the first value or the second value.In some examples, determining whether to initiate the COT for the firstwireless role is based on determining whether the ED value satisfies thefirst value. The operations of 1720 may be performed according to themethods described herein.

FIG. 18 shows a flowchart illustrating an example method 1800 thatsupports channel sensing procedures for communications at an IAB node.The operations of method 1800 may be implemented by a device or itscomponents as described herein. For example, the operations of method1800 may be performed by a communications manager as described withreference to FIG. 9 . In some examples, a device may execute a set ofinstructions to control the functional elements of the device to performthe functions described below. Additionally, or alternatively, a devicemay perform aspects of the functions described below usingspecial-purpose hardware.

At 1805, the device may identify a first value for a first channelsensing procedure associated with a first wireless role of the wirelessdevice apparatus and a second value for a second channel sensingprocedure associated with a second wireless role of the wireless deviceapparatus. The operations of 1805 may be performed according to themethods described herein.

At 1810, the device may determine an ED value based on the secondchannel sensing procedure. The operations of 1810 may be performedaccording to the methods described herein.

At 1815, the device may determine whether the ED value satisfies thesecond value. The operations of 1815 may be performed according to themethods described herein.

At 1820, the device may determine whether to initiate a COT for at leastone of the first wireless role or the second wireless role in accordancewith determining whether at least one ED value associated with thechannel satisfies at least one of the first value or the second value.In some examples, determining whether to initiate the COT for the secondwireless role is based on determining whether the ED value satisfies thesecond value. The operations of 1820 may be performed according to themethods described herein.

The following provides an overview of some aspects of the presentdisclosure:

-   -   Aspect 1: A method for wireless communications at a wireless        device apparatus, including: establishing a first wireless role        and a second wireless role for the wireless device apparatus,        where the first wireless role is associated with upstream        communications, and the second wireless role is associated with        downstream communications; performing at least one of a first        channel sensing procedure or a second channel sensing procedure        at the wireless device apparatus, where the first channel        sensing procedure is for the first wireless role and the second        channel sensing procedure is for the second wireless role;        initiating a COT at the wireless device apparatus for the first        wireless role in accordance with the first channel sensing        procedure or for the second wireless role in accordance with the        second channel sensing procedure, or both; and transmitting        during the COT via at least one of the first wireless role or        the second wireless role.    -   Aspect 2: The method of aspect 1, where performing at least one        of the first channel sensing procedure or the second channel        sensing procedure at the wireless device apparatus includes:        performing the first channel sensing procedure at a first        antenna panel associated with the first wireless role; and        performing the second channel sensing procedure at a second        antenna panel associated with the second wireless role.    -   Aspect 3: The method of aspect 2, further including: determining        a success of the first channel sensing procedure based at least        in part on a first ED value associated with the first antenna        panel and a first value associated with the first channel        sensing procedure, where the first ED value satisfies the first        value; and determining a success of the second channel sensing        procedure based at least in part on a second ED value associated        with the second antenna panel and a second value associated with        the second channel sensing procedure, where the second ED value        satisfies the second value.    -   Aspect 4: The method of aspect 1, where performing at least one        of the first channel sensing procedure or the second channel        sensing procedure at the wireless device apparatus includes:        performing the first channel sensing procedure and the second        channel sensing procedure at an antenna panel of the wireless        device apparatus associated with the first wireless role.    -   Aspect 5: The method of aspect 4, further including: determining        a success of the first channel sensing procedure based at least        in part on an ED value associated with the antenna panel and a        first value associated with the first channel sensing procedure,        where the ED value satisfies the first value; and determining a        success of the second channel sensing procedure based at least        in part on the ED value associated with the antenna panel and a        second value associated with the second channel sensing        procedure, where the ED value satisfies the second value.    -   Aspect 6: The method of aspect 1, where performing at least one        of the first channel sensing procedure or the second channel        sensing procedure at the wireless device apparatus includes:        performing the first channel sensing procedure and the second        channel sensing procedure at an antenna panel of the wireless        device apparatus associated with the second wireless role.    -   Aspect 7: The method of aspect 6, further including: determining        a success of the first channel sensing procedure based at least        in part on an ED value associated with the antenna panel and a        first value associated with the first channel sensing procedure,        where the ED value satisfies the first value; and determining a        success of the second channel sensing procedure based at least        in part on the ED value associated with the antenna panel and a        second value associated with the second channel sensing        procedure, where the ED value satisfies the second value.    -   Aspect 8: The method of any of aspects 1-7, where performing at        least one of the first channel sensing procedure or the second        channel sensing procedure at the wireless device apparatus        includes: determining one or more sensing beams associated with        at least one of the first channel sensing procedure or the        second channel sensing procedure; and performing at least one of        the first channel sensing procedure or the second channel        sensing procedure using the one or more sensing beams.    -   Aspect 9: The method of aspect 8, where the one or more sensing        beams correspond to one or more transmit beams and where        transmitting, by the wireless device apparatus, via at least one        of the first wireless role or the second wireless role during        the COT includes: transmitting via the one or more transmit        beams.    -   Aspect 10: The method of any of aspects 1-9, further including:        transmitting, by the wireless device apparatus to a parent node        or a central unit, a sensing capability, where performing the        first channel sensing procedure for the first wireless role and        the second channel sensing procedure for the second wireless        role is based at least in part on the sensing capability.    -   Aspect 11: The method of aspect 10, where the sensing capability        includes an indication that the wireless device apparatus        performs the first channel sensing procedure for the first        wireless role and the second channel sensing procedure for the        second wireless role as multiple nodes.    -   Aspect 12: The method of any of aspects 10 or 11, where the        sensing capability includes an indication of whether the        wireless device apparatus is capable of performing at least one        of the first channel sensing procedure while transmitting via        the second wireless role or the second channel sensing procedure        while transmitting via the first wireless role.    -   Aspect 13: The method of any of aspects 10-12, where the sensing        capability is transmitted as one or more of an F1-AP message, an        RRC message, or a MAC-CE.    -   Aspect 14: The method of any of aspects 1-13, where transmitting        during the COT via at least one of the first wireless role or        the second wireless role includes: determining a duplex        capability of the wireless device apparatus, a success of the        first channel sensing procedure, and a success of the second        channel sensing procedure; and determining whether to transmit        at least one of a first transmission from the wireless device        apparatus via the first wireless role or a second transmission        from the wireless device apparatus via the second wireless role        based at least in part on the duplex capability of the wireless        device apparatus, the success of the first channel sensing        procedure, and the success of the second channel sensing        procedure.    -   Aspect 15: The method of any of aspects 1-14, further including:        determining a first transmission timing of a first transmission        from the wireless device apparatus via the first wireless role        and a second transmission timing of a second transmission from        the wireless device apparatus via the second wireless role; and        determining a first sensing slot for performing the first        channel sensing procedure and a second sensing slot for        performing the second channel sensing procedure, where the first        sensing slot is aligned with the first transmission timing of        the first transmission and the second sensing slot is aligned        with the second transmission timing of the second transmission.    -   Aspect 16: The method of aspect 15, further including:        determining that the wireless device apparatus satisfies an        interference metric.    -   Aspect 17: The method of aspect 16, where determining that the        wireless device apparatus satisfies the interference metric        includes: applying a signal processing technique to at least one        of the first sensing slot or the second sensing slot.    -   Aspect 18: The method of any of aspects 15-17, where performing        at least one of the first channel sensing procedure or the        second channel sensing procedure at the wireless device        apparatus includes: performing the first channel sensing        procedure during a first measurement area within the first        sensing slot, where the first measurement area has a first time        duration; and performing the second channel sensing procedure        during a second measurement area within the second sensing slot,        where the second measurement area has a second time duration        less than the first time duration.    -   Aspect 19: The method of aspect 18, where the first time        duration is equal to four microseconds and the second time        duration is less than four microseconds.    -   Aspect 20: The method of any of aspects 18 or 19, where the        first measurement area and the second measurement area are        aligned in time.    -   Aspect 21: The method of any of aspects 15-20, where performing        at least one of the first channel sensing procedure or the        second channel sensing procedure at the wireless device        apparatus includes: performing the first channel sensing        procedure during a first measurement area of a first sensing        window, where the first sensing window includes the first        sensing slot, and where the first sensing slot includes a first        portion of the first measurement area; and performing the second        channel sensing procedure during a second measurement area of a        second sensing window, where the second sensing window includes        the second sensing slot, and where the second sensing slot        includes a second portion of the second measurement area, the        second portion of the second measurement area including a        smaller time duration than the first portion of the first        measurement area.    -   Aspect 22: The method of aspect 21, where the first portion of        the first measurement area includes at least four microseconds        and the second portion of the second measurement area includes        less than four microseconds.    -   Aspect 23: The method of any of aspects 15-22, where the first        sensing slot at least partially overlaps with the second sensing        slot.    -   Aspect 24: The method of any of aspects 1-14, further including:        determining a first transmission timing of a first transmission        from the wireless device apparatus via the first wireless role        and a second transmission timing of a second transmission from        the wireless device apparatus via the second wireless role; and        determining a first sensing slot for performing the first        channel sensing procedure and a second sensing slot for        performing the second channel sensing procedure, where the first        sensing slot is aligned with the first transmission timing of        the first transmission and the second sensing slot is offset        from the second transmission timing of the second transmission        based at least in part on the first transmission timing of the        first transmission.    -   Aspect 25: The method of aspect 24, further including:        determining that the wireless device apparatus fails to satisfy        an interference metric, where the second sensing slot being        offset from the second transmission timing of the second        transmission based at least in part on the first transmission        timing of the first transmission is based at least in part on        determining that the wireless device apparatus fails to satisfy        the interference metric.    -   Aspect 26: The method of any of aspects 24 or 25, where the        first transmission timing of the first transmission is within a        threshold time duration of the second transmission timing of the        second transmission.    -   Aspect 27: The method of any of aspects 24-26, where the first        sensing slot and the second sensing slot avoid overlapping with        either of the first transmission or the second transmission.    -   Aspect 28: The method of any of aspects 1-14, further including:        determining a first transmission timing of a first transmission        from the wireless device apparatus via the first wireless role        and a second transmission timing of a second transmission from        the wireless device apparatus via the second wireless role;        determining a first sensing slot for performing the first        channel sensing procedure; and refraining from performing the        second channel sensing procedure.    -   Aspect 29: The method of aspect 28, where the first transmission        timing of the first transmission is within a threshold time        duration of the second transmission timing of the second        transmission.    -   Aspect 30: The method of any of aspects 28 or 29, where the        second transmission is less than a threshold time duration.    -   Aspect 31: The method of any of aspects 1-14, further including:        determining a first transmission timing of a first transmission        from the wireless device apparatus via the first wireless role        and a second transmission timing of a second transmission from        the wireless device apparatus via the second wireless role;        adding a filler signal to a beginning of the second        transmission, where the first transmission timing precedes the        second transmission timing by a time duration equal to a        duration of the filler signal; and determining a first sensing        slot for performing the first channel sensing procedure and a        second sensing slot for performing the second channel sensing        procedure, where the first sensing slot is aligned with the        first transmission timing of the first transmission and the        second sensing slot is aligned with the filler signal.    -   Aspect 32: The method of any of aspects 1-31, further including:        receiving a configuration for performing the first channel        sensing procedure and the second channel sensing procedure at        the wireless device apparatus.    -   Aspect 33: The method of aspect 32, where the configuration is        received as one or more of an F1-AP message, an RRC message, a        MAC-CE, or DCI.    -   Aspect 34: The method of any of aspects 1-33, where the wireless        device apparatus is an IAB node and the first wireless role        includes an MT role and the second wireless role includes a DU        role.    -   Aspect 35: A method for wireless communications at a wireless        device apparatus, including: identifying a first value for a        first channel sensing procedure associated with a first wireless        role of the wireless device apparatus and a second value for a        second channel sensing procedure associated with a second        wireless role of the wireless device apparatus; determining        whether at least one ED value associated with a channel        satisfies at least one of the first value or the second value;        and determining whether to initiate a COT for at least one of        the first wireless role or the second wireless role in        accordance with determining whether the at least one ED value        associated with the channel satisfies at least one of the first        value or the second value.    -   Aspect 36: The method of aspect 35, where determining whether        the at least one ED value associated with the channel satisfies        at least one of the first value or the second value includes:        determining an ED value based at least in part on the first        channel sensing procedure; and determining whether the ED value        satisfies the first value, where determining whether to initiate        the COT for the first wireless role is based at least in part on        determining whether the ED value satisfies the first value.    -   Aspect 37: The method of any of aspects 35 or 36, where        determining whether the at least one ED value associated with        the channel satisfies at least one of the first value or the        second value includes: determining an ED value based at least in        part on the second channel sensing procedure; and determining        whether the ED value satisfies the second value, where        determining whether to initiate the COT for the second wireless        role is based at least in part on determining whether the ED        value satisfies the second value.    -   Aspect 38: The method of any of aspects 35-37, further        including: determining an ED value based at least in part on the        first channel sensing procedure; determining that the ED value        satisfies the first value; initiating the COT for the first        wireless role based at least in part on determining that the ED        value satisfies the first value; determining that the ED value        satisfies the second value; and including, within the COT        initiated for the first wireless role, one or more transmissions        from the wireless device apparatus via the second wireless role        based at least in part on determining that the ED value        satisfies the second value.    -   Aspect 39: The method of any of aspects 35-37, further        including: determining an ED value based at least in part on the        second channel sensing procedure; determining that the ED value        satisfies the second value; initiating the COT for the second        wireless role based at least in part on determining that the ED        value satisfies the second value; determining that the ED value        satisfies the first value; and including, within the COT        initiated for the second wireless role, one or more        transmissions from the wireless device apparatus via the first        wireless role based at least in part on determining that the ED        value satisfies the first value.    -   Aspect 40: The method of any of aspects 35-39, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing the first channel sensing procedure using a        set of sensing beams; determining an ED value based at least in        part on performing the first channel sensing procedure using the        set of sensing beams; and determining whether the ED value        satisfies the first value, where the first value is for the        first channel sensing procedure using the set of sensing beams.    -   Aspect 41: The method of any of aspects 35-40, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing the second channel sensing procedure using        a set of sensing beams; determining an ED value based at least        in part on performing the second channel sensing procedure using        the set of sensing beams; and determining whether the ED value        satisfies the second value, where the second value is for the        second channel sensing procedure using the set of sensing beams.    -   Aspect 42: The method of any of aspects 35-41, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing the first channel sensing procedure using a        beam pair; determining an ED value based at least in part on        performing the first channel sensing procedure using the beam        pair; and determining whether the ED value satisfies the first        value, where the first value is for the first channel sensing        procedure using the beam pair.    -   Aspect 43: The method of any of aspects 35-42, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing the second channel sensing procedure using        a beam pair; determining an ED value based at least in part on        performing the second channel sensing procedure using the beam        pair; and determining whether the ED value satisfies the second        value, where the second value is for the second channel sensing        procedure using the beam pair.    -   Aspect 44: The method of any of aspects 35-43, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing at least one of the first channel sensing        procedure or the second channel sensing procedure during a        sensing slot absent of transmissions from the wireless device        apparatus; determining the at least one ED value based at least        in part on performing at least one of the first channel sensing        procedure or the second channel sensing procedure during the        sensing slot absent of transmissions from the wireless device        apparatus; and determining whether the at least one ED value        satisfies at least one of the first value or the second value,        where the first value is for the first channel sensing procedure        during the sensing slot absent of transmissions from the        wireless device apparatus and the second value is for the second        channel sensing procedure during the sensing slot absent of        transmissions from the wireless device apparatus.    -   Aspect 45: The method of any of aspects 35-43, where determining        whether the at least one ED value associated with the channel        satisfies at least one of the first value or the second value        includes: performing at least one of the first channel sensing        procedure during a first sensing slot including transmissions        via the second wireless role of the wireless device apparatus or        the second channel sensing procedure during a second sensing        slot including transmissions via the first wireless role of the        wireless device apparatus; determining the at least one ED value        based at least in part on performing at least one of the first        channel sensing procedure during the first sensing slot        including transmissions via the second wireless role of the        wireless device apparatus or the second channel sensing        procedure during the second sensing slot including transmissions        via the first wireless role of the wireless device apparatus;        and determining whether the at least one ED value satisfies at        least one of the first value or the second value, where the        first value is for the first channel sensing procedure during        the first sensing slot including transmissions via the second        wireless role of the wireless device apparatus and the second        value is for the second channel sensing procedure during the        second sensing slot including transmissions via the first        wireless role of the wireless device apparatus.    -   Aspect 46: The method of any of aspects 35-45, further        including: identifying the first value based at least in part on        a first class of the first wireless role and the second value        based at least in part on a second class of the second wireless        role.    -   Aspect 47: The method of aspect 46, where the first class of the        first wireless role includes at least one of a wide-area class        or a local-area class.    -   Aspect 48: The method of any of aspects 35-47, where identifying        the first value and the second value includes: receiving an        indication of the first value and the second value as one or        more of: an F1-AP message, an RRC message, a MAC-CE, or DCI.    -   Aspect 49: The method of any of aspects 35-48, where identifying        the first value and the second value includes: receiving an        indication of the first value and the second value as absolute        values.    -   Aspect 50: The method of any of aspects 35-48, where identifying        the first value and the second value includes: receiving an        indication of at least one of the first value or the second        value as offset values relative to a default value; and        determining at least one of the first value or the second value        based at least in part on the offset values and the default        value.    -   Aspect 51: The method of any of aspects 35-48, where identifying        the first value and the second value includes: receiving an        indication of at least one of the first value or the second        value as offset values relative to an indicated parameter; and        determining at least one of the first value or the second value        based at least in part on the offset values and the indicated        parameter.    -   Aspect 52: The method of any of aspects 35-51, where the        wireless device apparatus is an IAB node and the first wireless        role includes an MT role and the second wireless role includes a        DU role.    -   Aspect 53: An apparatus for wireless communication at a wireless        device apparatus, including at least a first interface, a        processing system, and a second interface configured to cause        the apparatus to perform a method of any of aspects 1-34.    -   Aspect 54: An apparatus for wireless communications at a        wireless device apparatus, including a processor; memory coupled        with the processor; and instructions stored in the memory and        executable by the processor to cause the apparatus to perform a        method of any of aspects 1-34.    -   Aspect 55: An apparatus for wireless communications at a        wireless device apparatus, including at least one means for        performing a method of any of aspects 1-34.    -   Aspect 56: A non-transitory computer-readable medium storing        code for wireless communications at a wireless device apparatus,        the code including instructions executable by a processor to        perform a method of any of aspects 1-34.    -   Aspect 57: An apparatus for wireless communication at a wireless        device apparatus, including at least a first interface, a        processing system, and a second interface configured to cause        the apparatus to perform a method of any of aspects 35-52.    -   Aspect 58: An apparatus for wireless communications at a        wireless device apparatus, including a processor; memory coupled        with the processor; and instructions stored in the memory and        executable by the processor to cause the apparatus to perform a        method of any of aspects 35-52.    -   Aspect 59: An apparatus for wireless communications at a        wireless device apparatus, including at least one means for        performing a method of any of aspects 35-52.    -   Aspect 60: A non-transitory computer-readable medium storing        code for wireless communications at a wireless device apparatus,        the code including instructions executable by a processor to        perform a method of any of aspects 35-52.

As used herein, the term “determine” or “determining” encompasses a widevariety of actions and, therefore, “determining” can includecalculating, computing, processing, deriving, investigating, looking up(such as via looking up in a table, a database or another datastructure), ascertaining and the like. Also, “determining” can includereceiving (such as receiving information), accessing (such as accessingdata in a memory) and the like. Also, “determining” can includeresolving, selecting, choosing, establishing and other such similaractions.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover: a, b, c,a-b, a-c, b-c, and a-b-c.

The various illustrative logics, logical blocks, modules, circuits andalgorithm processes described in connection with the implementationsdisclosed herein may be implemented as electronic hardware, computersoftware, or combinations of both. The interchangeability of hardwareand software has been described generally, in terms of functionality,and illustrated in the various illustrative components, blocks, modules,circuits and processes described above. Whether such functionality isimplemented in hardware or software depends upon the particularapplication and design constraints imposed on the overall system.

The hardware and data processing apparatus used to implement the variousillustrative logics, logical blocks, modules and circuits described inconnection with the aspects disclosed herein may be implemented orperformed with a general purpose single- or multi-chip processor, adigital signal processor (DSP), an application-specific integratedcircuit (ASIC), a field-programmable gate array (FPGA) or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general-purpose processor may be amicroprocessor, or, any conventional processor, controller,microcontroller, or state machine. A processor also may be implementedas a combination of computing devices, such as a combination of a DSPand a microprocessor, a plurality of microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration. In some implementations, particular processes and methodsmay be performed by circuitry that is specific to a given function.

In one or more aspects, the functions described may be implemented inhardware, digital electronic circuitry, computer software, firmware,including the structures disclosed in this specification and theirstructural equivalents thereof, or in any combination thereof.Implementations of the subject matter described in this specificationalso can be implemented as one or more computer programs, i.e., one ormore modules of computer program instructions, encoded on a computerstorage media for execution by, or to control the operation of, dataprocessing apparatus.

If implemented in software, the functions may be stored on ortransmitted over as one or more instructions or code on acomputer-readable medium. The processes of a method or algorithmdisclosed herein may be implemented in a processor-executable softwaremodule which may reside on a computer-readable medium. Computer-readablemedia includes both computer storage media and communication mediaincluding any medium that can be enabled to transfer a computer programfrom one place to another. A storage media may be any available mediathat may be accessed by a computer. By way of example, and notlimitation, such computer-readable media may include RAM, ROM,electrically erasable programmable ROM (EEPROM), compact disc (CD)-ROMor other optical disk storage, magnetic disk storage or other magneticstorage devices, or any other medium that may be used to store desiredprogram code in the form of instructions or data structures and that maybe accessed by a computer. Also, any connection can be properly termed acomputer-readable medium. Disk and disc, as used herein, includes CD,laser disc, optical disc, digital versatile disc (DVD), floppy disk, andBlu-ray disc where disks usually reproduce data magnetically, whilediscs reproduce data optically with lasers. Combinations of the aboveshould also be included within the scope of computer-readable media.Additionally, the operations of a method or algorithm may reside as oneor any combination or set of codes and instructions on a machinereadable medium and computer-readable medium, which may be incorporatedinto a computer program product.

Various modifications to the implementations described in thisdisclosure may be readily apparent to those skilled in the art, and thegeneric principles defined herein may be applied to otherimplementations without departing from the spirit or scope of thisdisclosure. Thus, the claims are not intended to be limited to theimplementations shown herein, but are to be accorded the widest scopeconsistent with this disclosure, the principles and the novel featuresdisclosed herein.

Additionally, a person having ordinary skill in the art will readilyappreciate, the terms “upper” and “lower” are sometimes used for ease ofdescribing the figures, and indicate relative positions corresponding tothe orientation of the figure on a properly oriented page, and may notreflect the proper orientation of any device as implemented.

Certain features that are described in this specification in the contextof separate implementations also can be implemented in combination in asingle implementation. Conversely, various features that are describedin the context of a single implementation also can be implemented inmultiple implementations separately or in any suitable subcombination.Moreover, although features may be described above as acting in certaincombinations and even initially claimed as such, one or more featuresfrom a claimed combination can in some examples be excised from thecombination, and the claimed combination may be directed to asubcombination or variation of a subcombination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. Further, the drawings may schematically depict one more exampleprocesses in the form of a flow diagram. However, other operations thatare not depicted can be incorporated in the example processes that areschematically illustrated. For example, one or more additionaloperations can be performed before, after, simultaneously, or betweenany of the illustrated operations. In certain circumstances,multitasking and parallel processing may be advantageous. Moreover, theseparation of various system components in the implementations describedabove should not be understood as requiring such separation in allimplementations, and it should be understood that the described programcomponents and systems can generally be integrated together in a singlesoftware product or packaged into multiple software products.Additionally, other implementations are within the scope of thefollowing claims. In some examples, the actions recited in the claimscan be performed in a different order and still achieve desirableresults.

What is claimed is:
 1. An apparatus for wireless communications at anintegrated access and backhaul (IAB) node, comprising: a processingsystem configured to: establish a first wireless role and a secondwireless role for the IAB node, the first wireless role being a mobiletermination role, and the second wireless role being a distributed unitrole; perform a first channel sensing procedure and a second channelsensing procedure at the IAB node, the first channel sensing procedurebeing for the first wireless role and the second channel sensingprocedure being for the second wireless role, wherein the first channelsensing procedure is different from the second channel sensingprocedure; and initiate a channel occupancy time (COT) at the IAB nodefor the first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both; and a first interface configured to:output signaling for transmission during the COT via at least one of thefirst wireless role or the second wireless role.
 2. The apparatus ofclaim 1, wherein, to perform the first channel sensing procedure and thesecond channel sensing procedure at the IAB node, the processing systemis further configured to: perform the first channel sensing procedure ata first antenna panel associated with the first wireless role; andperform the second channel sensing procedure at a second antenna panelassociated with the second wireless role.
 3. The apparatus of claim 2,wherein the processing system is further configured to: determine asuccess of the first channel sensing procedure in accordance with afirst energy detection (ED) value associated with the first antennapanel and a first value associated with the first channel sensingprocedure, the success of the first channel sensing procedure beingassociated with the first ED value satisfying the first value, and thefirst value being associated with the first wireless role; and determinea success of the second channel sensing procedure in accordance with asecond ED value associated with the second antenna panel and a secondvalue associated with the second channel sensing procedure, the successof the second channel sensing procedure being associated with the secondED value satisfying the second value, and the second value beingassociated with the second wireless role.
 4. The apparatus of claim 1,wherein, to perform the first channel sensing procedure and the secondchannel sensing procedure at the IAB node, the processing system isfurther configured to: perform the first channel sensing procedure andthe second channel sensing procedure at an antenna panel of the IAB nodeassociated with the first wireless role.
 5. The apparatus of claim 4,wherein the processing system is further configured to: determine asuccess of the first channel sensing procedure in accordance with anenergy detection (ED) value associated with the antenna panel and afirst value associated with the first channel sensing procedure, thesuccess of the first channel sensing procedure being associated with theED value satisfying the first value, and the first value beingassociated with the first wireless role; and determine a success of thesecond channel sensing procedure in accordance with the ED valueassociated with the antenna panel and a second value associated with thesecond channel sensing procedure, the success of the second channelsensing procedure being associated with the ED value satisfying thesecond value, and the second value being associated with the secondwireless role.
 6. The apparatus of claim 1, wherein, to perform thefirst channel sensing procedure and the second channel sensing procedureat the IAB node, comprises the processing system is further configuredto: perform the first channel sensing procedure and the second channelsensing procedure at an antenna panel of the IAB node associated withthe second wireless role.
 7. The apparatus of claim 6, wherein theprocessing system is further configured to: determine a success of thefirst channel sensing procedure in accordance with an energy detection(ED) value associated with the antenna panel and a first valueassociated with the first channel sensing procedure, the success of thefirst channel sensing procedure being associated with the ED valuesatisfying the first value, and the first value being associated withthe first wireless role; and determine a success of the second channelsensing procedure in accordance with the ED value associated with theantenna panel and a second value associated with the second channelsensing procedure, the success of the second channel sensing procedurebeing associated with the ED value satisfying the second value, and thesecond value being associated with the second wireless role.
 8. Theapparatus of claim 1, wherein, to perform the first channel sensingprocedure and the second channel sensing procedure at the IAB node, theprocessing system is further configured to: identify one or more sensingbeams associated with the first channel sensing procedure and the secondchannel sensing procedure; and perform the first channel sensingprocedure and the second channel sensing procedure using the one or moresensing beams.
 9. The apparatus of claim 1, wherein the first interfaceis further configured to: output a sensing capability for transmissionto a parent node or a central unit, and the processing system performingthe first channel sensing procedure for the first wireless role and thesecond channel sensing procedure for the second wireless role is inaccordance with the sensing capability.
 10. The apparatus of claim 9,wherein: the sensing capability comprises an indication that the IABnode performs the first channel sensing procedure for the first wirelessrole and the second channel sensing procedure for the second wirelessrole as multiple nodes.
 11. The apparatus of claim 9, wherein: thesensing capability comprises an indication of whether the IAB node iscapable of performing at least one of the first channel sensingprocedure while transmitting via the second wireless role or the secondchannel sensing procedure while transmitting via the first wirelessrole.
 12. The apparatus of claim 1, wherein, to output signaling fortransmission during the COT via at least one of the first wireless roleor the second wireless role, the processing system is further configuredto: identify a duplex capability of the IAB node, a success of the firstchannel sensing procedure, and a success of the second channel sensingprocedure; and output at least one of a first transmission fortransmission from the IAB node via the first wireless role or a secondtransmission for transmission from the IAB node via the second wirelessrole in accordance with the duplex capability of the IAB node, thesuccess of the first channel sensing procedure, and the success of thesecond channel sensing procedure.
 13. The apparatus of claim 1, whereinthe processing system is further configured to: determine a firsttransmission timing of a first transmission from the IAB node via thefirst wireless role and a second transmission timing of a secondtransmission from the IAB node via the second wireless role; and selecta first sensing slot for performing the first channel sensing procedureand a second sensing slot for performing the second channel sensingprocedure, the first sensing slot being aligned with the firsttransmission timing of the first transmission and the second sensingslot being aligned with the second transmission timing of the secondtransmission.
 14. The apparatus of claim 13, wherein the processingsystem is further configured to: determine that the IAB node satisfiesan interference metric.
 15. The apparatus of claim 13, wherein, toperform the first channel sensing procedure and the second channelsensing procedure at the IAB node, the processing system is furtherconfigured to: perform the first channel sensing procedure during afirst measurement area within the first sensing slot, the firstmeasurement area having a first time duration; and perform the secondchannel sensing procedure during a second measurement area within thesecond sensing slot, the second measurement area having a second timeduration less than the first time duration.
 16. The apparatus of claim13, wherein, to perform the first channel sensing procedure and thesecond channel sensing procedure at the IAB node, the processing systemis further configured to: perform the first channel sensing procedureduring a first measurement area of a first sensing window, the firstsensing window comprising the first sensing slot, and the first sensingslot comprising a first portion of the first measurement area; andperform the second channel sensing procedure during a second measurementarea of a second sensing window, the second sensing window comprisingthe second sensing slot, and the second sensing slot comprising a secondportion of the second measurement area, and the second portion of thesecond measurement area comprising a smaller time duration than thefirst portion of the first measurement area.
 17. The apparatus of claim1, wherein the processing system is further configured to: determine afirst transmission timing of a first transmission from the IAB node viathe first wireless role and a second transmission timing of a secondtransmission from the IAB node via the second wireless role; and selecta first sensing slot for performing the first channel sensing procedureand a second sensing slot for performing the second channel sensingprocedure, the first sensing slot being aligned with the firsttransmission timing of the first transmission and the second sensingslot being offset from the second transmission timing of the secondtransmission in accordance with the first transmission timing of thefirst transmission.
 18. The apparatus of claim 17, wherein theprocessing system is further configured to: determine that the IAB nodefails to satisfy an interference metric, the second sensing slot beingoffset from the second transmission timing of the second transmission inaccordance with the first transmission timing of the first transmissionbeing associated with determining that the IAB node fails to satisfy theinterference metric.
 19. The apparatus of claim 1, wherein theprocessing system is further configured to: determine a firsttransmission timing of a first transmission from the IAB node via thefirst wireless role and a second transmission timing of a secondtransmission from the IAB node via the second wireless role, the firsttransmission timing of the first transmission being within a thresholdtime duration of the second transmission timing of the secondtransmission or the second transmission being less than a threshold timeduration; select a first sensing slot for performing the first channelsensing procedure; and perform the second channel sensing procedureduring a second sensing slot that does not overlap with the firstsensing slot in accordance with the first transmission timing of thefirst transmission being within the threshold time duration of thesecond transmission timing of the second transmission or the secondtransmission being less than the threshold time duration.
 20. Theapparatus of claim 1, wherein the processing system is furtherconfigured to: determine a first transmission timing of a firsttransmission from the IAB node via the first wireless role and a secondtransmission timing of a second transmission from the IAB node via thesecond wireless role; add a filler signal to a beginning of the secondtransmission, the first transmission timing preceding the secondtransmission timing by a time duration equal to a duration of the fillersignal; and select a first sensing slot for performing the first channelsensing procedure and a second sensing slot for performing the secondchannel sensing procedure, the first sensing slot being aligned with thefirst transmission timing of the first transmission and the secondsensing slot being aligned with the filler signal.
 21. A method forwireless communications at an integrated access and backhaul (IAB) node,comprising: establishing a first wireless role and a second wirelessrole for the IAB node, the first wireless role being a mobiletermination role, and the second wireless role being a distributed unitrole; performing a first channel sensing procedure and a second channelsensing procedure at the IAB node, the first channel sensing procedurebeing for the first wireless role and the second channel sensingprocedure being for the second wireless role, wherein the first channelsensing procedure is different from the second channel sensingprocedure; initiating a channel occupancy time (COT) at the IAB node forthe first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both; and transmitting during the COT viaat least one of the first wireless role or the second wireless role. 22.The method of claim 21, wherein performing the first channel sensingprocedure and the second channel sensing procedure at the IAB nodecomprises: performing the first channel sensing procedure at a firstantenna panel associated with the first wireless role; and performingthe second channel sensing procedure at a second antenna panelassociated with the second wireless role.
 23. The method of claim 22,further comprising: determining a success of the first channel sensingprocedure in accordance with a first energy detection (ED) valueassociated with the first antenna panel and a first value associatedwith the first channel sensing procedure, the success of the firstchannel sensing procedure being associated with the first ED valuesatisfying the first value, and the first value being associated withthe first wireless role; and determining a success of the second channelsensing procedure in accordance with a second ED value associated withthe second antenna panel and a second value associated with the secondchannel sensing procedure, the success of the second channel sensingprocedure being associated with the second ED value satisfying thesecond value, and the second value being associated with the secondwireless role.
 24. The method of claim 21, wherein performing the firstchannel sensing procedure and the second channel sensing procedure atthe IAB node comprises: performing the first channel sensing procedureand the second channel sensing procedure at an antenna panel of the IABnode associated with the first wireless role.
 25. The method of claim24, further comprising: determining a success of the first channelsensing procedure in accordance with an energy detection (ED) valueassociated with the antenna panel and a first value associated with thefirst channel sensing procedure, the success of the first channelsensing procedure being associated with the ED value satisfying thefirst value, and the first value being associated with the firstwireless role; and determining a success of the second channel sensingprocedure in accordance with the ED value associated with the antennapanel and a second value associated with the second channel sensingprocedure, the success of the second channel sensing procedure beingassociated with the ED value satisfying the second value, and the secondvalue being associated with the second wireless role.
 26. The method ofclaim 21, wherein performing the first channel sensing procedure and thesecond channel sensing procedure at the IAB node comprises: performingthe first channel sensing procedure and the second channel sensingprocedure at an antenna panel of the IAB node associated with the secondwireless role.
 27. The method of claim 26, further comprising:determining a success of the first channel sensing procedure inaccordance with an energy detection (ED) value associated with theantenna panel and a first value associated with the first channelsensing procedure, the success of the first channel sensing procedurebeing associated with the ED value satisfying the first value, and thefirst value being associated with the first wireless role; anddetermining a success of the second channel sensing procedure inaccordance with the ED value associated with the antenna panel and asecond value associated with the second channel sensing procedure, thesuccess of the second channel sensing procedure being associated withthe ED value satisfying the second value, and the second value beingassociated with the second wireless role.
 28. The method of claim 21,wherein performing the first channel sensing procedure and the secondchannel sensing procedure at the IAB node comprises: identifying one ormore sensing beams associated with the first channel sensing procedureand the second channel sensing procedure; and performing the firstchannel sensing procedure and the second channel sensing procedure usingthe one or more sensing beams.
 29. An apparatus for wirelesscommunications at an integrated access and backhaul (IAB) node,comprising: means for establishing a first wireless role and a secondwireless role for the IAB node, the first wireless role being a mobiletermination role, and the second wireless role being a distributed unitrole; means for performing a first channel sensing procedure and asecond channel sensing procedure at the IAB node, the first channelsensing procedure being for the first wireless role and the secondchannel sensing procedure being for the second wireless role, whereinthe first channel sensing procedure is different from the second channelsensing procedure; means for initiating a channel occupancy time (COT)at the IAB node for the first wireless role in accordance with the firstchannel sensing procedure or for the second wireless role in accordancewith the second channel sensing procedure, or both; and means fortransmitting during the COT via at least one of the first wireless roleor the second wireless role.
 30. A non-transitory computer-readablemedium storing code for wireless communications at an integrated accessand backhaul (IAB) node, the code comprising instructions executable bya processor to: establish a first wireless role and a second wirelessrole for the IAB node, the first wireless role being a mobiletermination role, and the second wireless role being a distributed unitrole; perform a first channel sensing procedure and a second channelsensing procedure at the IAB node, the first channel sensing procedurebeing for the first wireless role and the second channel sensingprocedure being for the second wireless role, wherein the first channelsensing procedure is different from the second channel sensingprocedure; initiate a channel occupancy time (COT) at the IAB node forthe first wireless role in accordance with the first channel sensingprocedure or for the second wireless role in accordance with the secondchannel sensing procedure, or both; and transmit during the COT via atleast one of the first wireless role or the second wireless role.